Doesn’t matter. Scroll down, there are hundreds of threads asking for more content: Xpacs, DLCs, new themes, etc. D3 has no MTX, so Blizz doesn’t care.
Immoral has people paying money for more power. D4 has people paying $5, $10, $100 for shiny cosmetic pixels. As long as people are dumping money into this, that is where Blizz’s attention will be. If you can convince Blizz that adding a cash shop to D3 where players will be willing to dump paychecks into it, then they may reconsider more D3 development.