I also have heard that Litecoin is the successor of the Bitcoin. However, if in the view of development until now, I think this is not possible. Due to the Litecoin of its development is very slow and now the price is getting crashed. A lot of people who are already investing in Litecoin however, they suffered a loss and this certainly very disappointing.
Same with other coin too. Take a look at Ethereum right now, it crash also and loses its value almost 70% from the year started. Litecoin is the closes coin next to bitcoin since it wa fork from the former. But its Ethereum that is in second in terms of market capitalizatrion. In addition, Ethereum has proven itself a worthy platform, since several ICO was launch from it.