The mempool has been constantly being emptied for a month, and even the month before, if we exclude the small build-up of two weeks because of the loss of hash rate and block speed transactions 3sat/vb were getting confirmed.
Looking at how things are going I would be more concerned about not people really wanting to spend their coins that much than fees raising back to ~75sat/b .
But that aside, this question about scalability has been asked so many times, just start reading from here about LN.
Even if mempool is empty most of the time, which is by the way not a great sign, those rare times when fees get high ruin user experience for many people, and those people will tend to think that fees are always that high, because they don't monitor the mempool. And eventually on-chain fees will be permanently high, because of how limited the blockspace is.