I think Yes, because there's no permanent in this world.
Top altcoins will keep changing over time because each coin cannot guarantee that it will be placed on fix rank because it depends on the crypto market and people will decide what would be the next series of top Altcoin in coinmarketcap.com in next few weeks or months.
Just like Ripple had overtaken Ethereum for almost a week but still Ethereum had raised back to the second seat as the highest market cap coin in the market.