Of course disabled people shouldn’t be forced to drive a cheap car regardless of wealth. If someone has the wealth to buy/lease a luxury car, they can still do that outside of the scheme.
Perhaps rather than removing the option for luxury cars, they should introduce means testing to access the motability scheme.
The purpose of the motability scheme is to ensure that disabled people have access to independent and reliable mobility. It’s to recognise the barriers that disabled people face. If someone has amassed wealth which would enable them to buy a luxury car, they don’t need a tax payer subsidised scheme to ensure their mobility.
I’m not a benefits basher. I truly support benefits being given to people that have a need for them.