[npoc]

Remain the same value or price?

If it remains the same value its USD price will increase at the rate of devaluation of the dollar which is 7% on average (value halves every decade)

If I wanted to make my bitcoin "productive", I could lend it to businesses and then receive interest on top - so bitcoin would go up in price at 7% and then I'd also receive back 5 to 10% more bitcoin per year.

No other asset will ever come close to this, without taking on risk or extra work. Which is why bitcoin will very likely also go up 2000% in value over the next decade.