The problem becomes easier if you dont consider the mempool as homogeneous.  You have three tiers, the high fee tier modulated by the nash equilibrium.  The low fee tier modulated by hadware/decentralization balance.  And the middle tier which is competed for by gamblers, other use cases, spammers and so on.

https://m.primal.net/IcHj.png  

 They during off ATM.. Their value is already under sats, and dropping. Eventually they'll be worth less than a sat, then its over (until next shitcoin on Bitcoin).. Although seems were getting shitcoins on LND too now.. So yay O.o..