Usually I'd say go for it, at least try. But given the point in the season you are in, you will be without boots for possibly 4-6 weeks. Trying to do warranties mid season sucks, it just does. Plus, most companies are sold out of a lot product already. You might send them in for warranty, wait the 4-6 weeks only to find out that the company wants to hook you up but they don't have anything to give you until next year.
Sucks. I don't think your boot is safe to ski as it is, but warrantying you boot will mean you won't have a boot for a considerable while. What size boot do you have? Give MP and BSL.