I agree there's no point in getting a Firefox OS phone if you have a phone with a decently modern browser. Their pricing and hardware positioning appear to be squarely aimed at those places where those are not available.
However, that takes nothing away from, and even supports the assertion, that webapps (or generally, pages that behave like apps) seem more future-proof. They'll work on your "phones with decently modern browser" too, regardless of what happens with Firefox OS.
However, that takes nothing away from, and even supports the assertion, that webapps (or generally, pages that behave like apps) seem more future-proof. They'll work on your "phones with decently modern browser" too, regardless of what happens with Firefox OS.