I wouldn't worry about global pandemics. They don't happen.
It's also worth keeping in mind that Amazon themselves are a poster child of this kind of thing, with their Oracle migration. If it took them a decade, what hope do you have?
Oh yeah, definitely. Definitely do not plan for that eventuality. Right now, we're in one so you have to be aware but when not in one, don't plan for it or mitigate that risk in any appreciable form.