That's only $10,000 per block, even at the price of $100 million. At the moment miners are earning about $250,000-$300,000 per block. And what when the subsidy is actually zero? Fees alone will sustain the network, and banning swaths of transactions which pay high fees will not be sustainable.
I'm of the opinion that the hash rate will come down after block rewards get closer to zero; of course we're talking decades down the line. So it won't be as expensive for miners to do their thing -- theoretically, in terms of the ratio of mining cost to BTC price. The hash rate is already inconceivably high.
First that choice has to be added to the implementations then those who don't want to see this spam would start activating that option and reject the spam txs and those who want to see this spam would start running nodes and relay the garbage! Then we can see if it is actually a small group or not.
That's how Bitcoin should always work.
You can be happy, resting assured that's exactly the way things are already working right now...
Of course, you can always run a pruned node as well, that option was always available.