You think people will "come back" to LTC. I am not so sure and worry about it.
I think if dogecoin and the others burn out, they will just make others.
I think litecoin is going to get pulled down to the single digit dollar value of other alt coins.
I'm not too worried about LTC. But with that said, I'm also not mining it. Because right now there's a strategy of mining the newest alts at low difficulties and attempting to trade them into BTC and rates that are 4-5X or even more than mining straight LTC. It's becoming more and more difficult to do this. And when scrypt ASICs become common, it's going to be impossible to do this, so they only things worth mining for most users will be whatever coins are well established by then - LTC being at least one of them.
In the past few days I've mined DGB, NOBL, and PXL. I plan to trade PXL into BTC later today if possible.