Sure but this is more akin to being a proscriptive grammarian rather than a descriptive one. Of course we could go old school and try to freeze language in time to be “proper”. This is taking a prescriptive approach to an extreme, in a sense.

There's a difference between a language changing, and a language completely dying out.

It’s part of a continuum. One wouldn’t say Spaniards speak Latin, not would we say Latin is a live language (beside some religious usage). One died another (of a few, in this case) grew. Some don’t have descendants, just as people.