It's been a while since I've made an X-Men post; I haven't really found anything to have an opinion on in the current batch of titles. I do like the first look of Hickman's revamp though. It's not really what I wanted per se, but the teams we're getting look good, and the individual synopses are at least interesting. The core book has a good team, even if it's a bit Summers-Grey heavy, but that's not necessarily a bad thing when we so rarely get to see them interact with each other as a family. It's nice to see the New Mutants in space again too (and completely ignoring both Uncanny and Dead Souls, it seems), and X-Force's use of Sage and Jean is something that's been teased for ages and never actually followed through on.
The titles themselves are less inspiring. Excalibur and Fallen Angels are blatantly just a copyright renewal scheme, and writing an Excalibur team with only a single European character is patently unjustifiable, as bad or worse than Marvel commissioned the Genosha team.
Marauders, while just as bad, can at least be justified in-story, depending on how Duggan and Lolli go about it. These have all been pretty sketchy characters at times. Emma, Pyro, and Bishop have all been outright villains, Ororo and Bobby have faked it in the past, and Kitty was teased all throughout the late 80s and mid-90s as a character who could eventually fall either way without surprising anyone. The pirate theme, seemingly justified by using Emma's shipping corporation as a cover story, is a natural fit for most of them. With the shipping company hook, I'm assuming they're going to be fighting human trafficking and arms proliferation as a primary reason for being, which is also a good place to bring Emma, as a reminder of what she was originally meant to be atoning for in her own eyes and those of her teammates.
As for the others, Bishop was a paramilitary freedom fighter, and later had something of a hit-and-run bandit ideology with his time-travel adventures. Ororo led the X-Men during the Australia-era, when they were a reactionary strike force, and had been branded as outlaws and terrorists internationally. Kitty has ties to the island of Madripoor and to Victor Creed himself, so it's not totally out-there that she might choose to call her team the Marauders. She was recently a cast member of the Guardians of the Galaxy during their ill-conceived phase as outlaws, has been known to rob banks from time to time, and her love of pirates is well established. So while they're all established heroes, having them be a bit shady for a while wouldn't come out of nowhere, when you look at where they've gone before.
Bobby is the odd-man out, even with his past in X-Factor, dating to the time when they were an undercover rescue team. But as he's friendly with Ororo and Bishop, and has worked with them extensively in the past, and is meant to be very close with Emma and Kitty. It's possible that he's just there to keep an eye on all of them, not unlike the role Ororo herself had on the Extinction team (and both Kitty and Lockheed in Astonishing, and Emma in New X-Men, and Bishop pre-Onslaught--if he's just there to spy on them and keep them out of trouble, this is definitely a team that could understand and approve).
The main conceptual problem as I see it is that it's basically a team of team leaders, and having them all roam around together looking for trouble is a waste of a lot of their individual talents. Ororo in particular is primarily known as a leader, and while maybe she's willing to step away from that from time-to-time, and might be willing to accept overall organizational leadership from someone like Scott, Erik, or Kitty, you're generally going to want to see her at least leading her own team. Bobby, more recently, has had an arrangement with Kitty to lead his own independent team. And Bishop is generally going to be leading at least half of the team to get the most out of his skill-set.
Hopefully, and in keeping with both the pirate theme and with Emma running a huge maritime organization, they'll get around that by just giving them each their own crew to play around with. That way, they can each be members of the overall "team," without backtracking in their long term character development. And then you could just have Kitty and Emma as the overall leadership, directing them from afar, which would also let the book get the most out of their own relationship, which is always more interesting when they're alone.