Considering how rapidly crypto is changing, I think it's safe to say Monero will be both obsolete and irrelevant in a few years.
I think if anything is going to reach parity with bitcoin it will be something completely new. Nothing on coinmarketcap is new. Even if you take all the best features of the top coins and put them into a new coin, it won't be enough to challenge bitcoin because all those features together are nowhere near worth replacing what's been working solidly.
Besides, altcoins are still being traded to- and from FIAT through bitcoin so I can't really see any of them reaching parity with bitcoin when they can't even get rid of bitcoin's fluctuation.