1) Yes and No. Yes in how his momentum has been diminished a bit since the MitB ppv and his change of character did hurt him a bit in terms of the storyline feud with Triple H. At the same time, the whole "Who Did It?" storyline still isn't finished so the WWE can easily have Punk regain his momentum once the situation involving Triple H and Laurinaitis clears up a bit more.
According to the news reports, Punk vs Nash was meant to last longer before it went to Triple H vs Punk but a combo of Nash's movie role commitment and his health issues forced the WWE to speed up the storyline.
2) Its a temporary thing but more towards how the RAW guest host thingy was meant only as a temporary idea but ended up lasting a bit over a year. The rosters are still separated but now feuds can bridge both shows instead of being stuck on just one.
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