I have every expectation that will be the case. Again, this isn't Caribbean Beach Villas. It's not an add-on to a moderate. It's conceived as an entirely separate destination...which just happens to be on land reclaimed from CBR. When complete, the proximity between Riviera and CBR will be similar to the (also separate) Beach Club and BoardWalk resorts.
Unless we find out otherwise, there's every reason to think that Riviera will have its own dining, shops, recreation and transportation. We already know riviera will have its own gondola load station separate from CBR's. We know it will have at least one TS restaurant. I don't think it's a stretch to assume there will be a QS dining option and some sort of pool.
Guests shouldn't be required to walk over to CBR for much, if anything. (Primary things that come to mind would be marina, playground(s), bike rentals, sports courts...such little-used amenities may not be duplicated at Riviera, similar to how BW doesn't have a marina and BC doesn't rent Surrey bikes.) But the close proximity of CBR means that Riviera guests will have even more options for dining, shopping, pool hopping, etc.