After getting a 5DII and 16-35mm f/2.8L II, I sold the 10-22mm.
FWIW, after about a year of use I sold my 10-22mm for only $50 less than I paid when I bought it new from Amazon. Pretty low barrier to moving to FF, IMO.
A bigger barrier that some people cite is the cost to replace those lenses with their FF counterparts. But I disagree - for the 10-22mm, even though I got the expensive 16-35 II, the 17-40mm is only 1mm less wide. Likewise, there are a whole bunch of people who claim that there is no EF 'replacement' for the 17-55mm since the 24-105mm is a stop slower and the 24-70 does not have IS. To that, I say false!! The 'FF equivalent' of the 17-55mm f/2.8 IS would be a hypothetical 27-88mm f/4.5 IS lens - therefore, the 24-105mm on FF is wider, longer, and faster than the 17-55mm on APS-C (note: faster in terms of DoF for the same framing, but the 1.3-stop ISO advantage of FF more than makes up for the 1-stop loss of shutter speed, so really the only thing you lose is activation of the f/2.8 AF points).