Barring a time machine, the "is it safe ten years from now" cannot be answered conclusively today. We're left to use other available evidence to make a risk analysis, like "mucking with the immune system tends to have effects that show up fast" and "what do we know about mRNA in the body, especially when delivered by viruses?". There's a risk to inaction, too.
We don't look at evolution and go "welp, can't test evolving humans from microbes, so we must avoid drawing any conclusions".
So go get vaccinated! If you trust the vaccine that it works, and that it's safe, go get it. I certainly have urged people I know who are high-at-risk and don't share my ethical concerns about them to get the vaccine.
If they're safe and effective, get vaccinated!
If they're safe and not effective, or lossy effective, we have very big problems and vaccinating the hold outs will not change anything
Barring a time machine, the "is it safe ten years from now" cannot be answered conclusively today. We're left to use other available evidence to make a risk analysis, like "mucking with the immune system tends to have effects that show up fast" and "what do we know about mRNA in the body, especially when delivered by viruses?". There's a risk to inaction, too.
We don't look at evolution and go "welp, can't test evolving humans from microbes, so we must avoid drawing any conclusions".