I don't think Bethesda would dare put up a suggestions/issues thread anytime soon. That would be far too much for them to bear
I think for now it's safe for people to fragment their opinions. Afterall an FO4 hasn't been announced, and no progress can be made until it has. So I think keeping it on a casual level does its job. Besides the devs are too busy screwing up their DLCs to worry about another title