Very true. My riding area is silty water with rock bottom. River levels fluctuate daily from inches to feet depending on the rain. No matter how safe I try to be it's a "for sure" I will chew up a liner before the summer ends. I end up "touching bottom" almost every ride with the ride shoe when cruising, or with the nozzle or rear bumper when I'm standing the machine end.
I always have an OEM liner on the peg board over the bench for when I get the machine home. I carry the tools to pull the pump off the machine in the field and have had to use the .22 to "motivate" a rock locked between the impeller/liner/rear veins (not suggested, but it can work when you are stranded). It's a good day if I don't have to pull out on a grassy bank to roll the machine up and pull a stick or rock out of the pump.
The dead liner is usually the work of someone else, but If there was a more durable solution I'd be game for trying it.