Yes! I preach this but people still seem to think they need to see their own vehicle when they look in the mirror. Proper mirror adjustment fixes 99% of the blind spot problem.Technically your side mirrors are intended to be aimed at your blind spot. Most drivers have them aimed down the sides of their car facing the rear which only allows you to see what is behind you. If aimed correctly, you shouldn't need any additional mirrors.
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I follow this:
How To: Adjust Your Mirrors to Avoid Blind Spots - Feature - Car and Driver
This doesn't help much if you are looking closely along your vehicle (spotting rocks, large cliff edges), but it gets the job done for daily driving. Might be an adjustment to some if used to the "make sure you can see your rear door handles" mentality that is taught alot.