A new creative would be a good idea. Fox should certainly make changes. The thing about reboots, especially soft ones, is that it can become harder to invest in the characters when they're being turned over. It also seems like reboots work better when time has passed (though there are exceptions), and when the creators have a vision for what they want to accomplish.
If it's just a commercial, we-think-this-might-play-better, you can wind up failing to offer something new and compelling enough to win people over.
Reboots do offer one plus, which is they seem to be safer. And it could work with the right creators. But, there are potential pitfalls to a soft reboot and expecting 800M WW.
It seems like identity questions would be there for sure, if we are looking at the same universe in the present day, why are different actors (aside from Famke and James) playing Scott, Jean, Wolverine, and Professor X?