The potential for this has been percolating all year, and now it is confirmed that the MLS Clubs have decided that U-15, U-16, and U-18 is the best plan.
Overall, I think this is the right call for a few reasons:
1. Players have a place to play in their U-18 year before they go off to college (there are more of these than those going pro).
2. Clubs are better able to retain players in their U-18 year who know they are going to college.
3. The "combined" age group gets shifted up one year from the U-16/U-17 year to the U-17/U-18 year. This gives players that extra year to develop before they face older competition.
It also gives clubs that extra year to see what they have in a player before deciding whether investing in their development (potentially at the expense of winning) is worth it.
4. MLS will be able to strengthen MLS Next Pro by seeing players matriculate up to the league a year later.
Who are the winners?
Winners: 07's win big-time. They will get two years as the highest age group. With that comes more eyes on their game, and more chances to increase their exposure.
You could also say that the 09's are small winners too in that the dreaded "two-time younger year of being the highest age group" won't fall on them. If this had come a year later, which was a distinct possibility, it would've happened to them.
Losers: 08's will now be the younger year of the two in the highest age group for two years in a row. This is tough for them. There's no doubt about it. This will cause plenty of 08's around the country to leave MLS academies to non-MLS academies. For the best 08's, it won't matter, but likely everyone else in the age group is hurt by it.
You could also say some of the slightly older youth age groups like '06, '05, '04 are small losers in that this change didn't happen earlier.
Other things to note:
-Some of the MLS clubs already had a U-15 AND U-16 team. They also had a U-17 team, and that will be going away. That U-17 will now be a U-18. These clubs already invested the money in this increased club, and quite frankly the results for the clubs that were investing this additional money it'll cost that not all clubs previously wanted to invest are extremely promising. DC's '06 age group, STLC's '06 age group, FC Dallas' '07 age group are all examples of how the extra age group helps.
-I have not fully investigated this, so anyone that knows more can correct me, but my read is that the non-MLS clubs are going to be pushed to eventually fall in line and make the switch. I don't think that they will be required to make the same change, but practically this will likely need to occur, whether for next season or down the road. From what I understand, this was primarily (maybe entirely?) a decision of the MLS clubs. MLS Next is run by MLS. Who runs MLS? Owners of MLS clubs. The key stakeholders in this were the MLS clubs.
-I've heard that part of the U-18 schedule will likely include a set number of games where the MLS U-18 teams are playing against non-MLS U-19 clubs. Most MLS clubs don't have U-19 teams, and with this you can be almost assured none will now. However, U-19's are a feature of a lot of the non-MLS clubs. I'd look for this as a major part of the schedule next season.
-I don't think we will see much initial change in when players integrate into the pros.
The 07's will get that extra U-17 season, but the majority of the relevant pro prospects from this age group are already playing MLS Next Pro or are training regularly with the MLS Next Pro team and close to making the squad. It is unlikely teams will tell them that they are doing a reversal and they will have to pause that for a year. If any do, you will likely see players who believe they are pros or on the verge of it leave. You can't pull that string, and I think the MLS clubs realize that.
While the 08's are losers in this switch, the majority of the players that clubs rate as future first team players are already training (and some playing) in MLS Next Pro. Like with the U-17's, it's unlikely that'll be paused.
There have only been a few 09's who've played in MLS Next Pro, and not many have trained at that level yet either. Few have even reached the U-17's. This change might push back the year they integrate into the MLSNP team, but few were close to that anyway, so it's not necessarily a change for them.
Conclusion:
Future age groups like the 10's, 11's, 12's we will likely see it fully fleshed out what it looks like. The age groups that are in the middle of these changes are likely to not deliver us the best results of what to takeaway from the implementation of these changes. However, I think the initial takeaway is that this is an overall positive for the highest level of youth football in this country.