Who the hell would want to wake up one morning, only to find that your spouse is gone and that your kids no longer exist, and that you are back in High School again???
Wasn't that the plot of "Peggy Sue Got Married"?
In any event, the rumors floating around seem to be that Peter agrees to this because it's the only way to save the lives of MJ and Aunt May. He has to give up his life with MJ to save both their lives. Great power...responsibility...yada....yada.
Also, I remember reading a column by Peter David once where he reported that Marvel has figures that show a large percentage of its' readership turns over every five years or so anyway. By Marvel's then-thinking, David said, undoing the marriage won't have long term negative effects, in that only a certain percentage of existing fans would be around to be pissed off for long. If that's the case, maybe Marvel believes that there pay off will be more readers who want a Spidey closer to the movies and the Ultimate book (single and young).
I'm not endorsing the rumored plot, simply reporting what Marvel's rumored logic seems to be.
