Aren't we? The phoenix force is primal and often prone to instinctual behavior. Its hosts, once in possession of the force, tend to behave similarly. Not even almighty Jean Grey's mind could wrangle it in. The Phoenix Force is the X-Men's Galactus, but without any of that listening to reason bs.
We don't know. Phoenix
did create a host body to replace the near dead Jean. It could do that ad infinitum. But that's assuming that the connection between Hope and the PF is only tenuous and fragile right now. If Hope is full on possessed, even though the raptor isn't here yet, we do know that killing the host tends to drive the PF from its body, thus averting disaster. Claremont/Byrne's run is the precedent for that.
Certainly a possibility. HOWEVER, we've yet to see whether or not her power is limited to mutant mimicking or whether or not she can do non-mutants. And, if she can do non-mutants, can she also mimic primal cosmic beings? If so, she'd be a beast up against Galactus or any of the other cosmic big-wigs. Whole lot of "ifs" here.
Clearly not, but there's no proof that it'd choose any other host at this point. More over, we're guessing that it's even headed for any x-people. Like you said, Hope could just be a bad-ass cosmic-level mimic. Again, too many variables. Can't blame Wolverine for going with his gut, as its served him well over the years. (Y'know. Except for that time when he killed all his kids.

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