Litecoin organisation could do an early block halving if it wanted a quick fix to the problem (many other coins have done changes to their block halvings). It would half the amount of coins the elevated number of non-miners with mining equipment can sell of each day for Fiat Currency and the price of coin would start going up.
The people mining and holding litecoin would not mine, because the price would start going up again. Those seeking to cash out into Fait Currency might be upset though! LOL
changing the reward scheme is dead to any crypto...
if we would accept that we could stay with fiat
btw its not possible to force this: all users (or atleast pools and exchanges) have to switch to the new variant