[Da Uniq 1]

I think it is safe to assume that if they change to LTL, it won't be anytime soon. I wouls also assume Sprint will give perks to those with outdated devices (due to the switch) to get updated devices.

The also came to Terms with their 4G provider Clear, and they are constantly pushing for new 4G devices to their portfolio so you should be good for a while.

Just my opinion. Hope that helps.