I dove for about 12 years and accumulated about 60 dives (1980 - 1992). I stopped diving after my first was born, and didn't start again for 12 years or so, and I have another 50 dives or so since then. At least 95% of those dives are solo. I was comfortable after only 3 or 4 dives after starting again, and I have spent thousands of dollars on new gear since picking up diving again (last year). I can't imagine it being in the dive industries best interest to interfere with that.
When selecting a buddy, isn't it important to evaluate their capabilities? If they are rusty, they should be paired with a "less rusty" partner. New partner's should go over procedures before diving, and the rusty diver might learn a little (or the less rusty diver may opt out of the dive). Probably not that much different than diving with a newbie, but the old rusty diver might be very comfortable under water...
I realize that not everyone is as serious about diving as I am, and they may never be competent given their limited diving, but I would hate to see them categorized with more serious divers, and then have my diving privileges affected as a result. I suspect I was as safe as a newbie on my second dive after picking back up diving, past that on the third.
As a seperate issue though, some of the stuff I learned in 1980 is now outdated. Would a refresher course to bring me up to modern beliefs be warranted? Probably so, but I chose to refresh myself without a class (I audited my son's naui class DVD), and I continue to research modern techniques.