well hardly surprising if FIA limits/freezes engine development that the teams are then looking somewhere else
IMHO they should scrap the current rule book and start over new:
1. dimension/minimum weight/4 open wheels:
2. driver safety
3. fixed amount of fuel / maximum weight of batteries _which every year gets reduced by 5%_
fuels allowed: all commercial available fuels: gasoline, diesel,electricity etc.
no fuel pitstops
no restriction on engine, transmission development
at end of race remaining/unused fuel gets measured: teams which used least amount of fuel gets bonus points for construction championship (if a car fails to finish it get's no bonus)
edit: oh and teams should be free to decide if they want to start with 1 cars ... if a team has little money it can start with only 1 car if it wants