As Brock Purdy advances, I wonder if Trey Lance will be available

I have no clue. What I think is they don’t go next season with to youngsters, and as they advance the logical choice will be Purdy over Lance.
True, but they gave up a lot for Lance and they have to pay neither of them next year. Remember, his dad drafted rg3 and Kirk the same year. Jimmy G is gone but this is not a problem for them right now.