People should be taught how to adjust their mirrors properly so that they do not have a blindspot.

If a car is designed so that no amount of adjusting can get rid of the blindspot, then that car should be illegal (Chevy Malibu).

I don't believe that is possible. If it were possible, it wouldn't be called a blindspot. Of course a mirror should be well adjusted, but I don't see how it substitutes for checking the blindspot. Try it in a driving test; you will fail the test.