It's called common sense.
If you, chapelbull, were a G5 coach with two conference championships in your three year tenure (assuming Kiffin wins tomorrow), and you're eyeing P5 jobs (but pass on the current SEC vacancies for some stupid reason), would you rather:
1: Stay at the program you've built up for another year to make a third conference championship run, and then see if there are better P5 offers (better than mid-tier SEC schools)
2: Start a new G5 rebuild, where you would hurt your image by leaving after a single year (and he has worked hard to remove that black mark from Tennessee), so it's at least two years before you're looking for P5 again.