Nah, there's no way Eth would beat bitcoin. Bitcoin has like 7 years ahead of Eth.
I see your point. We can say "MySpace" "MySpace" "MySpace" until we're blue in the face, but that comparison does have a sell-by date.
It also has a big counterexample. Ever since eBay achieved critical mass about fifteen years ago, its dominance has never been threatened: not once. It's still the #1 online auction house and it's going to stay #1 for the foreseeable future.