If they solve those well enough, it means a lot of the operational restrictions that make helicopters very limited in scope (few landing sites, insanely high operating costs due to needing very specialised, highly trained pilots and maintenance crew etc.) could be somewhat lifted.

Fairly big "if" though. Rotary wings are inherently high energy, and heavier-than-air flight has much, much tighter safety and reliability requirements than cars for a good reason.