Bullshit. Take Two could force R* to do the same, but they CHOOSE not to. Ubisoft isn't forced. That said, I also blame the audience that buys all this shit up day one.
That's not really how it works. Rockstar have repeatedly come under pressure from shareholders to release GTAs more frequently, to cash in on the brand more aggressively, but Rockstar insist it would hurt the long term value of the IP. Yves can't tell the board of directors/owners that they can't sell yearly AssCreeds, because they very clearly can.
Moreover, when Rockstar do stray from the GTA path, they're still sometimes showered in riches. RDR sold twelve million, the sequel should do even better, they're also a far smaller company of course. It's much harder to justify the continued expenditure on franchises the market have already shown indifference to.
Ubisoft's customer isn't us, it's the owners, and if they're unhappy, they'll remove the CEO and put in one who'll make changes they feel are required. They do as they're told, and they're told by people who are in it for money, not 'art'.
