They said last night there were 20 Predators left in the inventory
I know there have been several Predators lost over the years but I don't know how many, nor do I know how many have been produced to date. Given their generally good track record, I'm sure quite a few more a on order. However, it may not be easy to increase the production rate. You're always at the mercy of the long lead time items. In the case of the Predator, those are probably related to the sensor package or the satellite communications system.