I don't think the subject is inappropriate, but I do question the timing. This is all hypothetical and at least a year off. I wonder if the need to ask this now is more about your recent rupture within the context of your on-going struggle with money issues.

I also think your life choices have to take priority. If it comes to pass that you change jobs (and at this point you really can't know what a new job will pay), you make that decision on the basis of what's best for your life. How it effects your time/money spent in therapy is a secondary issue. Cross that bridge when you come to it.

Sometimes obsessively trying to control future circumstances is less about prudent planning and more about creating paralysis/distraction in the present.