I kind of get the feeling that the reason why Johnny and The Lost MC got the shaft in GTA V probably had more to do with higher ups at Rockstar or Take-Two than with the Housers.
Dan Houser has actually spoken against some of the more dubious decisions that were made in GTA V, such as the lack of single-player updates or the micro-transactions in GTA Online. IIRC, he mentioned in an interview that he did not want to include the Shark Cards in GTA Online but was overruled by someone higher up at Rockstar/Take Two.
I'd love to see an open-world game set in NYC during the 70's. If anything, I think it would be an awesome idea if GTA VI is set in Liberty City during the 1970's, especially if they expanded the map to include The Carroways and the entire state of Alderney (or maybe have a rural region based on upstate New York) and they wouldn't have to worry about trying to re-license The Warriors either.
Dan Houser did give an interview a while back where he criticized Current Year woke culture for both stifling potential creativity and more importantly, being so over the top and ridiculous that it's near impossible to satirize.
During that interview, he did sort of imply that he wanted to make the next GTA game a period piece since it'd be more timeless and could focus on the setting and story more easily as opposed to trying to make satire out of an already very ridiculous world.
If you ever wonder why so many people on YouTube and GTA Forums are convinced that the next GTA game will be set in Vice City during the 80's again, this is why.