I liked the Death split personality persona when it first appeared in the Kyle/Yost run of X-Force. It made Warren different from the other X-characters. Now it just seems like a death sentence for Warren waiting to happen. That's what I mean when it reminds me of Phoenix. Usually when the Phoenix shows up Jean ends up dead. Neither of wich I would want for Warren.
As for weather or not the other X-Men are concerned about Warren, well, there are some spoilers about that in the Uncanny issue 2 preview. I usually do a pretty good job of avoiding previews these days, because I don't want to judge a comic based off of a partial preview. But, I gave in on this one.
I'll agree that Warren having issues with the Death persona has been given a bit of for shadowing, but it has been all over the place. Soule's Astonishing stated that X had fixed Archangel's mind. In Bunn's X-Men Blue, Warren was shown as being able to remain in his Archangel form with no control problems. And Finally, in the Astonishing Annual, Warren is shown as having trouble controlling his Archangel personality, even though he was already supposed to have been cured of it by X. The only thing that I can guess s that X deliberately lied about fixing Warren's mind.
Come to think about it, Warren did mention to Psylocke that he would have to leave the press conference because the senator was making him angry.
Still it is disappointing to me that they are going down this road again. I wanted a new story.