Keeping Feet for the sake of disabled cubers is one of the weaker arguments for keeping Feet, but it’s a valid one. I personally know one cuber who because of a congenital condition only has one fully functional hand. He could compete in OH on a level playing field, but why limit him to one event? (You could make a case for FMC, too.)
Of course you could, the same way that if you have prosthetic legs you can still run a marathon, but most major marathons have wheelchair divisions, most competitions of any kind that are open to the public to compete have some division for people who are unable to compete on a level field. There is no good reason for cubing to be different in that respect.
To make everyone equal would be a mess. Providing some reasonable accommodations is not.
IMO the argument for Feet from access for disabled individuals is not a strong enough argument in itself to add feet as a new event, but it is strong enough to keep the event and added to the other arguments for keeping Feet it adds to an already very strong argument.