Dollar Devaluation Coming Soon

Hi Smart People,

I know you are here, and so I ask: What happens to my mortgage, (7 yrs old, fixed rate, 5%) when the $ is devalued?

Do I gain on this deal? If not, how can my contract, which is legally binding under the Constitution, be amended without my consent?

I only promised to pay back $, not gold, oil, or whatever.

Thanks for your smart answer!

Angry