The dream is to be able to live off one project (like FNAF, Undertale, Stardew Valley, whatever other indie game that takes off on YouTube) and make millions upon millions.
Arin thought he had enough fame and social capital to "make" a game take off - which is something that he probably feels would lend him legitimacy as an "important dude" (like the AVGN game, the Penny Arcade games, PewDiePie's game, YOGSCAST Cameos in Sonic Racing and TF2 items, etc). But then he even went a step further and tried to make whatever the video game version of "Oscar Bait" is and pushed the LGBTQIABBQ+ angle super hard - to a point where it made actual gay dudes uncomfortable.
He wasn't wrong, but they forgot to make the game any good (Like FNAF, Undertale, Stardew Valley, whatever) and it was so bland that no one that didn't know Arin personally gave a shit about it. Because no one cared, there was no controversy (aka Depression Quest, or any Anita Sarkeesian type shit) to push copies the "bad" way either and even if there was, Arin "super white guy with remarkably easy job" Hanson is not really an oppressed face that people could rally around for SJW nonsense.
The rumors are that GameGrumps, Inc are having some pains in the cash flow department (garage sales, working to clean up the image for advertisers, etc) and Dream Daddy is a product they could sell essentially forever. It doesn't cost them any more money to generate more steam keys, so it's actually a smart move to push in that direction. It would have been a smarter move to make it actually good, though.