What is the mechanism that ensures bitcoin inflates proportionally to the dollar?
But when people say inflation in the context of cryptocurrency they usually mean "deflation".
If USD prices rise, the price of BTC will also rise, as BTC is another product you can buy with your USD. Meaning your bitcoin wealth is not affected by USD inflation.
Pure speculation.
The volatility of Bitcoin, the fact it can hardly be used, the fact that almost no merchants accept it....