I don't see any reason for Bitcoin to stay up so high in price. Bitcoin was the first crypto to come to existence and then was used for exchanging to altcoins, but now there are new promising altcoins that will do a better job at exchange between currencies.

Before i had to buy BTC and exchange it so some other altcoin. Now i use ETH more often. Cryptos for instance like COSS will try to offer an exchange between other currencies.

Lightning network might promise to fix Bitcoins issues, but it might just be easier to adopt a cryptocurrency that doesn't need fixing.