Being an owner of a few domains, I am concerned about "product obsolesce".
All business owners should be looking at potential threat to their revenue stream
on the horizon. (5 forces analysis)
It might not happen within the next 5 yrs. But, I wouldn't guarantee it won't happen in our lifetime.
Sunken cost in the current system is massive (trillions?), not including the incalculable value of URL mind-share... it's just become too big to abandon or even to initiate substantial change in the forseeable future.
I'll also never say never, but I won't be counting the years.