This is not a big surprise to happen with litecoin since mining litecoin is not profitable anymore and those 60% hashrate are sticking to another coin. As you can see some altcoins just like raven, grin were getting a huge increase on its total hashrate. As long as that will not give a bad impact to the litecoin network and nothing to be worried. Even if the block will be less difficult but the major players or miners will be a party that can take the advantage from there consider about the small miners have been moving their hashrate to the another altcoin like cryptonight coins.
But with the hashrate was going down a lot and the possibility of 51% attack will increase.
Miners do their job for profit if the Litecoin mining does not guarantee profitability as before, they will not do it anymore and will switch to another crypto with a higher profit. I am imagining that if Bitcoin comes here to reduce the reward by 50% whether miners will continue mining or they will stop mining. In order to maintain mining, the price of Litecoin or Bitcoin must be pushed up.
Similarly, Bitcoin attacks 51% can happen to Bitcoin because when small mines are closed and only large mines are left if they shake hands to perform 51% attacks, it is possible.