The variable with ECNL is the age line. The other issue with ECNL in SoCal is there simply aren't enough teams in SoCal (10 on the boys side IIRC)....so say you are a kid in Thousand Oaks that wants to play top flight but at the same time play high school don't make LAFC-Real-SoCal because that year's team is an established championship team...for another team you are looking at a commute over the mountains to Santa Monica or to Ontario. Also ECNL is bigger in other places than SoCal. For example, MLSN does not have a large presence in the Pacific Northwest. However, if we finally get the girls academies (and they are coming...the others have caught up to the USWNT based on an academy system so it's only a matter of time), I think that might pressure ECNL.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 issue with what's left in the EA is for those clubs that didn't get the promotion for MLS2 a lot of the better players are looking for other slots. So you'll have some teams that are established, and some teams that are brand new (and the soccer boards right now are full of these teams advertising for people....not so much for MLS2...even more for EA2). Play will be extremely variable (as it will for MLS2) for some years to come until things settle down. But EA is definitively now the third tier.