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I assume that mRNA will vaccinate for a lot of diseases, which means that a lot of new viruses will emerge through this evolutionary pressure. It's possible that we are also starting the same race as with antibiotics. Which is still better than people dying from these tiny evil viruses

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That's not really how it works, First, vaccines prevent infection in the first place so the virus never has a chance to replicate and mutate, unlike antibiotics which are given after infection and there are a massive number of bacteria and only the most resistant survive. Second, there isn't anything about vaccine acquired immunity thats different from infection acquired immunity, so any evolutionary pressure would already be there.

> First, vaccines prevent infection in the first place so the virus never has a chance to replicate and mutate

Ideally, yes, but in practice people still tend to develop a viral load, their immune system kicks in faster, and the result is a very brief infection.

>Second, there isn't anything about vaccine acquired immunity thats different from infection acquired immunity

This is not true with the mRNA vaccines.

Are there really a lot of viruses lying in wait for current viruses to get out of the way before they can start spreading? I find that hard to believe

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