Letter leagues strategies are all the same, maintaining exclusivity but expanding membership at the same time.
So far it works. MLS Next start by mixing the "high level free academy" and the "regular" clubs, then keep expanding roster size. Another brilliant idea is MLSNext Flight 2 but calling it "MLSNext Academy" (most of my friends and family believe that this MLSNext academy is the highest level thus fulfilling the bragging rights).
Combining NPL with E64 could achieve this strategy, especially by throwing "ECNL" in the announcement. I think it would be more effective if they call them ECNL, ECNL Homegrown, ECNL Academy, ECNL Next.
They tried with ECNL-RL but people somehow keep misspelling it to ECRL thus reducing the brand value.
Does ECNL-RL-Socal still exist?