I have a 7D with an EFS lens that I have not touched in nearly 6 months. I bought a 5D MK III last March and tried to like my 7D after that! Sorry, I just love that 5D MK III. I thought I would keep the 7D as a backup body but keep wondering if I really should.
For the prior 7 years I have only had one body along when I traveled. It seems to me it is time to part with it but I keep hesitating...
You've kind of answered your own question. It sounds like your style of shooting, particularly when you travel, a single body does the job. Neuro's suggestions of either an M or an S95/S100 (S110/S120) which is 100% pocketable and does surprisingly good video would be great travel companions.
A lot of photographers like to use two bodies to keep lens changes in the field to a minimum. I have a couple of clients, one a steel maker and the other an oil company whose location projects are in dirty, gritty often windy environments. I take three bodies, one with 16-35, one with 70-200 and a third with a lens that will suit the project...that may be the 300 f/2.8, the 24-70 f/2.8II or a very bright prime.
If you're saving for a $10k lens, you'll do better selling the 7D sooner rather than later, as the chameleon which is the 7DII may actually materialize in the first half of 2014.
A possible reason for keeping the 7D is the extra reach offered by the x1.6 APS-C crop sensor. A $10k lens is probably going to be a long one like a 400 f/2.8II, so on the 7D you'll have an equivalent FOV of 640mm at f/2.8. Appealing? Of course if you sell the 7D and miss it, it's a very simple matter to get another one without dropping a penny on the deal.