I'll make TWO (2) quick comments:
1) Just because HBK is taking time off after Wrestlemania, doesn't mean that an idea like this can't work...or isn't a good idea. Hell - have HBK do all these things, give him some time off (WITH the world title in tact or have him relinquish it), and then have him come back any time he wants. In this case, the anticpated return of the now "greatest legend of all-time" would be pretty decent.
2) Obviously - HBK beating 7 fresh competitors in MITB (right after defeating Taker) would be unrealistic. However -a few things to consider.
- The 7 fresh competitors could always beat up each other while a tired HBK sneaks up the ladder and great the briefcase
- The WWE's target audience is about 12 year old on average anyways (if that) and so things don't have to be perfectly realistic.