Seems BTC/LTC are the only chains that will survive "long term" since they would not hit any type of tail emissions until 80+ years from now
Maybe I get you wrong, but it seems like what you saying is, BTC would still be mined for 80+ years. Technically true. But in 2 month 87.5% of all BTC will be already mined.
And after another two halvings that would be 96.875%.
Basically for 50 of those 80 years miners would literally mine last 0.1% of Bitcoins.
