By the time this will be a problem in 100 years, we'll have long moved to something else, like graphene or whatever.
I don't know why people are freaking out about it so much. My guess is it has to do something with oil propaganda. After all, the best myths are those that have a "seed of truth" in them. So once the oil industry started its anti-lithium propaganda, a lot of people must be thinking "well, it does ring kind of true, doesn't it?", even though their "facts" are 99% misleading.