So you think the problem of high-tech spambots is that there aren't enough people using them? Is your goal to make forums and such unusable as fast as possible?
Since this comment got some attention, my source for this was
[0] Ranney, Wayne. “How Rivers Carve Canyons.” Carving Grand Canyon - Evidence, Theories, and Mystery, 2nd ed., Grand Canyon Association, 2012.
Not to take away from your point, but from what I have read, the Grand Canyon was most likely not formed by little drops of water, but instead by occasional torrents of water. There is ~70 feet of boulders and detritus at the bottom of the Colorado River. Only a flood powerful enough to get all that material moving at once will erode the bottom of the river bed and carve the canyon deeper. The slopes and walls probably erode more continually though.
And in geological time, an every-10,000-year event may as well be like every day to us.
Plenty of disabled people can use scooters. Not all disabilities involve a wheelchair. Some people are just severely restricted on top speed, or distance, range of motion, or other factors. Scooters can make perfect sense for some people with disabilities who may not be able to ride bikes.
The important point is that animal agriculture is calorically inefficient, so much more land has to be used than if people could substitute plant-based food sources for animal-based. Much of plant agriculture today is only necessary to feed animals. Some animals could probably still be fed with plant agriculture byproducts if little to no land were directly used only for raising animals, but far fewer than are currently raised.
And many grasslands that cannot be sustainably be used for crops could be returned to wilderness rather than plant agriculture, if we were to increase caloric efficiency of food production. They probably should be, in fact. This doesn't preclude some animals being raised, but if we don't greatly reduce the amount of land used for raising animals, deforestation, desertification and other harms will continue to degrade ecosystems.
Better to leave natural habitat on that land rather than clear-cutting forest for grazing land, as happens so much these days and in the past. Better food production efficiency means less forest razed which is a significant win.