On what basis that rumor says the next bitcoin is Litecoin?. In my opinion, the position of bitcoin will never be replaced with any coins, because in addition to the limited supply of bitcoin, bitcoin is the king of all coins. So in my opinion that is impossible.
Basically, the price of coins depends on demand and supply on the market. If demand on the market for Litecoin is very large, I think the Litecoin price can only offset bitcoin prices.