I do not think that the current fees for transaction are low because it reaches usually $100 dollar or more per block, so miners get good revenue now,
But after halving If the price did not doubled at least, miners will start accepting only high fees transaction , forcing the users to pay more
or..
stop being greedy and hoard the 12.5btc per block and cause a demand rise!!
miners who sell coins at a loss and then cry and try to get subsidized elsewhere are missing the point that they are a factor in how bitcoin as a whole is priced.
imagine it this way. imagine miners jumped to minimal fee of 0.00025 instead of 0.0001 (10cent instead of 4cent right now)
if bitcoins customer usefulness dies because it costs 10cents to move just $2, that kills off people buying domain names.
it kills off people buying the alpaca socks it kills off people buying advertising. it kills off people just getting 1cent from faucets to learn how to use it,
it kills off people wanting to just buy a drink at a bar.
so less people will want to use it.. and demand dies.
secondly retailers like domain websites stop offering domains for bitcoin because customers are not buying domains using bitcoins. retailers and bars stop selling food and drink due to customers not using bitcoins.
future scenario
so the number of merchants accepting bitcoin dies off. again impacting demand.
the price of bitcoin falls, so instead of being $400, its then lets say $200.. where now the tx fee of 0.00025 is now 5 cents.. so miners then push the fee's up to 0.0005 (10cents), they see less transactions due to desire to use declining. so they raise the fee's to 0.001 (20cents)
some dumb corporate shill will say that bitcoin fee's are in theory cheaper than debit card fee's. but that is wrong. bitcoin fees should not even pretend to compete debit card fees or pretend that its acceptable to try matching debit card fee's.. bitcoin is not universally used and so bitcoin
needs to be better cheaper and more useful all by itself, if it wants to succeed. bitcoin is no where ready to be market competing dominance to just charge what they like because people are willing to pay.. these narrow minded miners and core devs dont realise bitcoin is not even 1% useful to the world. so it is not yet time to become greedy at the risk of killing off usefulness
the best suggestion is not transaction fee rises. or bottlenecking transactions, or dividing classes of premium paying transactions vs second class transactions.
bitcoin needs to expand to allow more transactions through so its easier to use without hours of delay (10 minutes acceptable settlement time). and needs to be cheap as possible to make people want to use it.
miners have no need to start a fee race for 2 decades. and by starting now they are just shooting themselves in the foot. without thinking long term impact across the community