Is Ethereum still viable as a future currency now that it's deflationary?

One of the biggest problems for Bitcoin's use case as a currency is the fact that it's designed to go up in value, this is in my eyes the main reason why Bitcoin is seen as more of a hedge against inflation instead of a currency nowadays. (which it was initially designed to be). Now, this concept has me thinking a lot about Ethereum and it's path to becoming the new future currency of the world. Has Ethereum now screwed itself by becoming a deflationary asset? I feel like more and more people are treating Ethereum like silver, as if its Bitcoin's (the internets gold) little brother. And yes, I know that Ethereum is nothing like Bitcoin. Ethereum has smart contracts, its PoS, and has a lot more going for itself that Bitcoins dinosaur tech. Look, I can 100% see Ethereum being massively successful within its own ecosystem. It really is the currency of every dApp built on the Ethereum blockchain, BUT. Will someone ever really spend their precious Ethereum on a car? It just sounds stupid to do so. Of course it's just a matter of time and adoption before crypto-assets become more stable. But that doesn't remove Ethereum's deflationary properties. I'm no blockchain expert, but doesn't Ethereum get more deflationary the more its used? I am genuinely curious about any thoughts other people have on this. The only type of currencies I see becoming the worlds 1 currency is an inflationary one. Imagine if the dollar became inflationary..