Very exciting to see Brightline West break ground. They're on a very ambitious timeline but it sounds like they're well aware of that and operating accordingly, so hopefully they get it done.
Obviously Rancho Cucamonga isn't quite as direct as everyone would like, but the challenges of trying to close the gap to LA in one seat don't seem surmountable in the near term, requiring either the original plan of a connection to CAHSR, which then needs to actually tunnel through the mountains into LA; or a substantial reconstruction of the Metrolink line that connects at Cucamonga to support high speed trains. Either way, it's something that can be addressed in the longer run while some kind of service gets running. Also worth noting, in the run-up to the Olympics and in general there is a lot of investment going into transit in the LA area aside from Brightline. I have friends there now who are very excited about the systems that will be coming online in just the next few years, and the surge of crowds for the Games will be an opportunity for many to try utilizing those options.
Palm Beach Gardens sounds like an interesting infill opportunity. In the long run, it will be curious to see how service patterns might develop once the overall system has more capacity. Hopefully Jacksonville starts taking notice of what's going on.