ECNL should probably think about booting Rage and adding Lamorinda in the East Bay (not saying they will...they just should consider it). Rage has been somewhat reduced to a feeder for Mustang as they aren't run as well and the geographical proximity to Mustang even during rush hours makes it easy for players to choose either. Lamorinda almost never loses players to Mustang for soccer reasons (usually only if a player/parent gets really pissed over something). Over the past couple of years Rage has been losing players not only to Mustang but also the lamorinda DA teams. That is not good.
While lamorinda is geographically almost as close to Mustang they are really far apart time-wise during rush hour traffic (when kids practice!) and they are positioned to make a more logical division of East bay players. Makes way more sense for Mustang to draw from regions south of their location (since they already do despite having Rage right there) down the 680 corridor and then east towards Livermore/Tracy and west towards Hayward/Castro Valley. Lamorinda would draw from their own area and then west into Oakland/Berkeley/Richmond and north to Benicia/Vallejo. Players in the Walnut Creek/Concord area could choose either with similar travel times. Essentially this would put two ECNL teams positioned in such a way that one or the other is reasonably reachable by the majority of the East Bay at commute times. Only issue for lamorinda is their size (they are really small) as they already have like 3 other soccer organization sharing their small area.
While I can't argue the logistics in your proposal, I'm personally pulling for Rage. They hired a new DOC from San Juan last year who appears to be leading real change within the club. I know she's also brought in a number of new coaches for the upcoming season. Time will tell, I guess.