Dropping "the bridge" would virtually prevent direct resupply (of everything - including food and fuel for those living there), and it's a long vulnerable corridor the other way. Also it was putins pet project, and would be a huge hammer blow to his ego after they spent so much time and money building it, so I'm sure it's still considered a target.
That said, I can't see Ukraine wasting precious missiles in the hope they can take it down. If it is to be taken down, it will likely be from the sea, using one (or more) of the drone ships they've developed, but it would have to be large and probably co-ordinated attack. russia wanted Crimea for use by it's black sea fleet, but they've largely ababdoned it, because the ships were vulnerable to missile attack.