How are you defining elite? Div I quality? If so, I would think the number would be over 100. I've seen 30 Div. I commits for the Class of 2018 from Slammers (12), Blues (11) and Strikers (7) alone.Like I said a long time ago there are about 25-35 elite players per age group in all of SoCal. That is enough for 2-3 teams max. The remaining 8-10 teams worth of players are good but they hold back the elite players and really defeat the "purpose" of GDA.
Though, even with Div. I quality as the definition, I admit you'd need closer to 300 to support consistently elite soccer for the 13 girls DA and 7 ECNL teams per age group currently in SoCal.