I think there is a bit of confusion when it comes to MLS 2 if you look at the list in Souther California of Teams now with MLS 2 there are only 5 new clubs added that did not already have MLS Next. Which means that of the 18 clubs in the league this first year 13 of them already had MLS Next Programs I am not sure how that would change the landscape. What does this mean for EA? Well it will mean that some teams from EA will be moving up to MLS 2 however many of the clubs staying EA and new teams coming in to the league will make it much more competitive as it takes shape in the next year. EA will have a North and South Division now which will most likely have 15 - 20 teams per division this means there will be 30 to 40 total EA Teams in SoCal so I am not sure how the 5 teams that moved to MLS2 would have that big of an impact on EA and the level of competition. One thing I will say and you heard it here first mark my words, in a few years not sure how many, ECNL for boys will begin to disappear and eventually be completely gone.
The existing clubs that are now MLS2 are moving their former EA teams to MLS 2, that’s why there will be a big impact on the EA level of competition. Their 3rd teams that were either in EA2 or SoCal will now be their EA team. The hypothetical player movement from MLSN -> MLSN 2 -> EA would make it more like a 2.5 tier, but it is what it is.
My guess is that ECNL boys will most likely be on par with MLSN2 as it pans out, I doubt it will be gone in a few years.