Yet that style has worked for them.
That represents sales in excess of $750 million, Bethesda says; see all the record-breaking numbers here.
www.gamespot.com
So I'm sorry bud, there is a strong trust that the fans have with that set up that I'd argue supported those day 1 sales. (me included). Many of us only care about the content, a fancy new engine is nice and all, but we care about the actual overall game first and foremost and if the team doesn't want to make a new engine and are fine using the one they have, I don't see many really giving a shit considering Fallout 4's record sales.
Many of us simply don't fucking care.
So this whole "matter of time" should have made Fallout 4 their biggest failure, not breaking multiple sales records. MS would be smart to simply allow the team to make their game how they see fit that works for THEIR TEAM, MS would be smart to learn that fucking lesson from EA and not force a team to work on a engine they are not familiar with.
Shit I thought Frostbite would do wonders for Mass Effect, it truly is an amazing engine.....IN THE RIGHT FUCKING HANDS, you can't just FORCE someone to use a engine and then act surprised when it ends up some technical train wreck. I don't blame Bioware for that mess, it was a branch of a new team, I blame EA for forcing that engine.
So MS's best bet is to allow the team to work on a engine that gets THEM the best result. The best engine on paper, doesn't always mean what the best engine is for that team in general.