It makes perfect sense until such time you have several months under your belt with the 7D & 5D to establish what you are missing in your photography - any half decent crop kit will have a great crop lens and a longer 70-x00/100-400mm zoom, I'm currently buying new lens at about a average rate of 1 per year, I'm currently short on really wide and pondering the 10-22 & 8-15, the latter doesn't make as much sense now, but may do in a few years should I go full frame, the former makes sense now, but what if my crop body breaks tommorrow, would I buy crop or full frame, I couldn't possibly answer that right now.
Photography is a hobby that many of us build upon over the years, it's nice to have a perfect kit, but it's nicer to ensure the bills are paid and you have a roof over your head. Don't let folks on here tell you what you MUST have, just take the advice and work out what suits you for today.