Sounds like a good plan to me. My upgrade path for bodies stops at 7D, or whatever its micro-adjusting, magnesium-built, weather-sealed, fast-autofocusing, crop-sensored equivalent is in about 2 years.
The plan that's evolved as a cheaper 5D3 solution for me is this:
1. Replace the T2i with a new 7D.
2. Upgrade (my interpretation) my walkaround lens from the 15-85mm to a 17-55mm.
3. Upgrade my 70-200 f/4.0L to a 70-200 f/4.0L IS.
4. Get a 10-22mm for the wide side.
Good luck with the 7D.