well yes to us but then again the marketing team at bethesda sued mojang (company behind minecraft) because of their game scrolls sounds like elder scrolls. so i wouldn't underestimate the legal team.
That sort of thing isn't unusual and is an unfortunate consequence of the way trademark law works. In the US at least, if you don't defend a trademark, you run the risk of losing it. Because of this, often companies will go after anything that seems like even the most remote risk of infringement.
Anyway, getting back to the main topic, Bethesda has been known for actually using the licenses they acquire, and STALKER does have elements in common with the sorts of games Bethesda has been known to make. So I think if Bethesda were to acquire the license, they'd likely use it. Of course, right now that's just rumor. The license could turn up anywhere--or nowhere at all.