If everyone believes this, then certainly it has an impact on BTC adoption, I would think.
First, there's plenty of people who think the opposite. notme is just one example among many. Personally I also think inflation will win over deflation, but I know I might be wrong.
Second, if high inflation happens, yep sure it'll impact btc adoption. but the vast majority of people will mainly go to "classical" inflation hedges : precious metals, real estate, etc. The last 10 yrs is a good example of that.
Bitcoin went to 0.01$ to around 20$ right now. The inflation play is only responsible for a tiny part of this rise.
I repeat, to me the biggest drive in btc price rise is just that it's a superior form of money, and people start to realize that. The number of people who even heard about bitcoin once is crazy small, not even talking about people who actually put some of their savings in BTC. It's a long process, but without new competitors it's bound to happen.