It'll be longer than that. If during that 2.5 years more and more companies move away from US companies, why do you think they would just abandon the non-US company to move back to a US company? The non-US company would have to be sooooo bad for that to happen. Also, there's no guarantee that the next US administration will be the opposite of the current, and even if it is there's no guarantee the one after that won't flip back.