In theory, there's no reason that grpc-web couldn't support a new protocol. That would be complicated, though; Envoy would also need to support it, and the gRPC team has already designed a protocol that they presumably like.

Connect supports gRPC fully, so you shouldn't ever be locked in - you can always migrate systems to `grpc-go`, one piece at a time. We intend all the Connect projects to be community projects - we're happy to accept contributions, design proposals, and anything else. At the same time, we're committing our resources to keeping these projects well-maintained.