GTA as a series definately has mass-market appeal, but I don´t agree that the rest of the hardcore-game developers will suffer. As proof of that is that many new, AAA, with very high standards IPs were developed and achieved multimillion status.
Eventually, some niche genres may suffer as gamers may demand better technological quality. However, such hardcore of niche genres already know that gameplay always comes first, so I really doubt that such genres will suffer.







