If it does, Tesla won't be able to keep up with demand. As proposed, limited to US made EVs.
Say the trade in value of a 2018 M3 is $26,000,
Tesla pledged to include value of FSD. I doubt it will be 100%, so let's say $6000 if one paid $8000
Plus $10,000 point of sale rebate
$6k upgrade to 2021 refresh M3. $16k if keep FSD.
If there is a $50k price cap on the rebate, just add FSD after delivery.