You're confusing betting on a company/product vs betting on technological improvement in general.

It is absolutely the case that virtual reality technology will only get better over time. Maybe it'll take 5, or 10, or 20, or 40 years, but it's almost a certainty that we'll eventually see better AR/VR tech in the future than we have in the past.

Would you bet against that? You'd be crazy to imo.

There's a kid outside the window of the place I'm staying who's been in the yard playing and talking with people online through his VR headset for like 2+ hours. He's living in the future. Whatever happens, he and his friends are going to continue to be interested in more of this.

Whether what they're using in 20 years is produced by the company formerly known as Facebook or not is a whole different question.