What’s the total savings from signing the 2-year lease? X
What’s the penalty for bailing? Y
So you get X if house prices decline slowly over 2 years (and you don’t buy), and lose Y if they drop very quickly and then start rising (and you buy). Only you know X and Y.
I doubt that prices will plummet very quickly and then start rising, all within 2 years. It’s possible, but then the $100,000’s you’ve saved on the house should easily cover the lease bail-out penalty (assuming it’s a few $1000).