I know power line is bad in many ways. It is also the most simple, so depending on the use the OP has in mind it might be cheap, easy and suitable.

The way to future proof is a conduit, so that you can pull through whatever gets invented in 20 or years time and your cat 6 is obsolete.

Trying to second guess that cat 6A might be able to support some 25GB future standard is a fools errand. In the OPs situation, install cat 6 in conduit and if you need to pull through something else in 20 years it’ll be an easy job.