Could it? Yes.Just pointing this out but Rowlet could still technically evolve.
Should it? Yes.
Will it? Probably not.
Not because of the everstone or marketability in general. Its hugely popular Ash mon. I think out of All of Ash's bse stage pokemon, barring bulbasaur, rowlett would probably be the most popular. And unlike say, oshawott, whose arc would have benifited from an evolution, i dont see any progression for rowlett even if it evolves.