I had an employee review with my manager this week, at my request. She told me she wasn't comfortable uptraining me right now even though they badly need the help in the position I asked to be crosstrained for, because they'd rather hire someone just for the role; but we could talk about it again in two months. After a little digging, I found that (A) they can't afford to lose me from my lower-paid role and (2) they know I'm looking for another job and don't want to train me until I demonstrate I'm planning to stay.
My response is that (A) well you're definitely gonna lose me now and (2) I'm definitely no longer willing to stay.