The ETH/BTC ratio is presently about 0.068. It needs to reach 0.16 to "flip" BTC in market cap, though I'd argue it would probably be a little less than that in all actuality because many more BTC have been lost for forever on a relative basis than ETH because everyone thought BTC was a joke in the beginning.

Do I think it can get there? Yes. It's hard to say what the odds are. But seems like a relatively good gamble to me. I think BTC is the safer overall bet as just a crypto to buy and hold. But ETH may outperform in general over time.

The major reasons I see ETH outperforming over time is simply that people both use and build on it far more than BTC. By factors of about 10x, consistently. See for yourself:

https://cryptofees.info/
https://www.developerreport.com/

I do wonder if BTC will get left behind technologically. Of course, it's stability and lean software may be what saves it in the long run. Hard to know.