If the Litecoin dev team adopts Mimblewimble, then it'll be a game-changer for the privacy of its underlying blockchain network. This would allow Litecoin to distance itself from Bitcoin in every way. There will be "FOMO" across the crypto market, because of LTC's newly adopted privacy feature.
That's a big "IF." Mimblewimble is a completely different algorithm, with completely different set of rules. If LTC adopts Mimblewimble, there would be a coin swap I imagine. Theymos likes Grimcoin too.