The past few months, Edge has needed the help of La Familia and Vickie to win his matches, so since he'll be in a Cell without any help, they need to help get him over as a guy who can hang with Taker. Plus, it gets him more heat, since everyone loves Foley, and he hasn't done anything physical in a year.
And who said the segment sounded good in the grand scheme of things? Foley cuts a Foley promo, Edge kicks his ass, it sounds like a good segment.
I don't see how this builds to an Edge-Foley feud, but if it did? I wouldn't mind that all, given the great chemistry they've shown they had. I do think Mick should stay retired for his own sake though