I don't think having franchised dealers would change that. Ultimately dealers are just middlemen, buying the car from the manufacturer for X price and selling it for Y price. They don't get into the inner workings of the price the manufacturer charges them.
Giving dealers a cut would move it from Mercedes - Lexus - BMW competitors to the Maserati - Bentley - Aston-Martin range, a much smaller market.
Dealer sales are monitored a lot more closely than Tesla sales are now.