I would think ALL Tesla owners could afford ferraris.
But in all honesty going from 500K/250K to 300K/150K is a big drop and will impact close to 90+% of Tesla buyers ( I wonder if Tesla still will continue to "show" prices on their website assuming 10K rebate/tax-break?) and maybe 30-40% of Volt/Bolt buyers (?).
Extra incentive to low income family - I agree with others that they probably can't/won't go for new cars anyway - but I see the point of trying to make up for not being able to take full $7500 federal tax credit in those cases.