Well it was mentioned in the last quarter's shareholders call that apple had set aside funds for a product transition.
I think moving .mac as it stands to being free, with say $69 a year for 10-20Gig of .mac storage integrated with backup/time machine would fit that bill.
I know of a few people that'd pay that kinda money to know that all their docs and digital photo's were secure. Plus iWeb and the other ilife/iwork packages that integrate with .mac are currently a bit of a joke when you have to fork out for .mac just to make em work.
For any current payed up members, they'd get the storage included up til end of current year.
edit: Just remembered there was news of a level 2 data centre that Apple bought around this time last year, fill it with xserve RAIDS, some google know how in massive redundant filesystems (GFS) and you'd have an awesome repository for all Mac Users "Precious Things". Apologies to all that don't get that reference, i feel sorry you've never experienced the League!
M.