I personally doubt the possibility of litecoin overtaken ethereum, though Litecoin has been around a lot longer than Ethereum, but Ether has grown in value far quicker. Then there are smart-contracts to consider.
One thing of note here is that Ethereum is the more functional, the more versatile, and the more technically impressive than Litecoin.
In my opinion, Litecoin has a long ways go to if it will overtake Ethereum.