These exist now.
Virtually all BEV/PHEV can use the same L2 connector.
There are three standards in the US for fast charging, CHAdeMO, CCS, and Tesla. CHAdeMO is deadman walking. Even Nissan, who holds the patents for it, has abandoned it. Electrify America has a CHAdeMO handle at most of their locations (the rest being CCS). Tesla has said they will eventually add CCS. EvGo already has chargers that support all three.
The “OMG Different Standards” BS is really just FUD spread by people who don’t know the first thing about EVs.