In 2006 I wanted to see just how good I could get with a bow. I shot nothing except my Hummingbird recurve for several months. In my quest for accuracy I also realized aluminum arrows were much better than the wood I had been shooting for 20 years.
Regular practice with one bow and good matching arrows was quite an eye opener for me. I shot better than I thought I was capable of. I even had my best year ever on groudhogs with a total of 36, two dozen more than a typical summer.
In spite of the enjoyment I got from shooting really well I missed shooting my other bows. Nothing reboots my mind like a peaceful walk in my stumping woods with a longbow and back quiver full of wood arrows. I eventually called my experiment a success and went back to regularly switching bows at will.
Shooting only one bow will definately help with your accuracy, but it is just so incredibly boring!