Considering oculus is paying for devs to code to their set bar, I'd say the vive will be just fine for the next few years.

1) it can do more than rift could day 1

2) it can do more than rift can (as advertised) whenever rift gen1.5 comes out. (If you tell me rift can do roomscale, I know. that's not the point. think for a second)

3) oculus is paying devs to develop to a standard that will not catch up to what vive can do today for quite some time

4) vive is extensible. It supports up to 7 child controllers. The wands make two. This opens doors for full body tracking with foot pucks, belts, 3rd party controllers.

5) lighthouse scales incredibly well. Lighthouse is an inside out tracking system. Meaning tracking is done internally from outside inputs that don't need to be verified by the sender. One lighthouse can be used to have an infinite number of HMDs defending their place in space with zero overhead per tracked device. The only limit is physical space, the space the hmd takes up and occlusion etc due to HMDs taking up physical space. It cameras do not scale as well. For every addition to increase tracking volume and occlusion issues, you have to introduce a new camera input. Which is more usb bus, more memory to handle the video feed. More CPU (although oculus has this very efficient, it is still and additional overhead)

So yea... It's fairly future proof. We will probably see new optics and screens. Also kind of waiting for one of them to adopt tb3. Full wireless would be nice too but that can be done by a third party at any time.

Tl;dr. It's fairly future proof. The more future proof of the two main HMDs out right now. If we can't get 3+ years out of it, I'll be surprised. But also expect newer tech in displays and optics in the meantime.