The price of Moreno has risen so fast, but it has not fall fast. For now, it's picking up faster than the other top-level altcoins! I guess Monero's rise is not speculation.
If Monero continues to be such a stable altcoin, it may come to better places than Ethereum.
Monero is better than Etherum, Litecoin, and so on.
I personally think, we will see Monero beeing the closest coin to
BTC in Q3 2018. Rangedriver had the exact same prediction a few days ago

The big question is where will bitcoin be at that point, and what % of its market cap could we expect Monero to occupy? Currently ETH is about 40% of bitcoin's market cap.