They won't be moved to CAHSR, the service will be shortened to Merced to Sac and Merced to Oakland, hopefully that comes with increased frequency and investments for both to reach bi hourly service.
FLIRTs have modern crash safety standards I really wouldn't worry about them in a crash.
OCS equipment can easily be added to them later when lines get wires.
They were always viewed as a stop gap here the services wanted a new fleet of bi levels large enough to accommodate the growth to 80+ sets in service
They should be very similar to those but with hydrogen gear instead of a diesel engine