I've been using Macs for two years (three at work) and, aside from the once-in-a-blue-moon use of iPhoto (which I've largely superceded with Photoshop anyway), I've never had a use for any of the iLife apps that came bundled with my mini. Really, how essential are they? As far as I can see they're all for amateurs self-producing media, and most people just don't do that.
Anyway, Macs come with iLife bundled, so all 'switchers' will be exposed to iLife as if it had been included with OS X. Only the longer-term Mac users wanting an upgrade will have to pay extra, and if they want those kinds of features they'd certainly do that rather than switch to Vista
. Smart strategy, really; I can't see why they'd change it.