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Eye and hand tracking are supposedly the only way to interact with the device, so unless your app is not interactive at all, you will use them.

Eye tracking and hand gestures are the default way to interact with the device, but it also supports pointing and even normal cursor navigation via a paired trackpad or mouse in the interest of accessibility.

I'm assuming that in the long run the idea is that if you're developing for the platform you own one (or your company does). The labs are a bridge for the first batch of developers, not Apple's long-term plan.

I imagine, like touch, Apple would not allow apps dont don’t work without it’s primary input.