The car dealership has very limited room as they’re under contract. They might be able to adjust fees and add-ons but that’s where they actually make money. Lowered purchase MSRP is up to the manufacturer. If the manufacturer changes the price it may impact their stock price which could start a cascading self destruction. The market is much more complicated than the average person realizes.
It's also the dealership that is holding the bag when it comes to covering the costs for their inventory. The high rates haven't been helping them, nor has the inflated prices. Lower interest rates won't help much in a short term given the rising inventory levels and there needs to be buyers. Moving vehicles through lower margins at least generates cash while reducing interest and tax liability.
There's lots of inventory out there and the situation for some manufacturers, like Stellantis, the question then becomes what does 'right-sized' look for their business.