It wouldn't bother me in the slightest. I only use wifi for downloading books and I am usually well stocked up. I have over a thousand books on my kindle and most of them I haven't read yet, so I can't imagine being away from home and needing to download a book. In the remote possibility that I needed to download something I'd use my phone as a wifi hot-spot and hook my kindle up to it.
In the UK there is now only one 3G capable version of the kindle for sale on the amazon website (Keyboard). I wonder if that means they are phasing out 3G over here.