Many of them definitely won't, but daylight and the location of management's homes are still limiting factors to off-shoring. Synchronously managing people in distant time zones is no fun, and trying to do it asynchronously is really inefficient. There may be a solution to this 'problem', but until they come up with it, letting people work remotely from their homes in the same city isn't a slippery slope to all jobs being off-shored.

Or, probably more accurately, it is a slippery slope, but not a very steep one. I do believe that jobs (and wages) are going to get distributed differently in the future. But, I'm hopeful that it'll be an improvement over having every high-paying job be in the same 5 dystopian cities.