Got to agree with OP in a certain way, though I think personally it's less the dollar cost of the fee (although this will for a long time be the focus) but the percentage of the tx amount. So yes, miners will need the fees incentive but if the sat cost becomes too high, it makes it less interesting for me.
Exactly, the fee increases in terms of dollar price it isn't gonna be an issue but when the fee needed is about 10 or 20% of the TX size of day-to-day transactions then the system could fall apart, to be honest.
LN can be the only solution to avoid this from happening but it is a slow gradual process and it will take a while to be adopted until then we may have to halt the TX which isn't worth transacting due to sudden congestions and I stand by that way as well.
Anyway, I don't expect this congestion to last more than a couple of weeks from now.