I notice the situation that the OP mentioned a lot. Perhaps it's not "poorly skilled" divers, but rather, inexperienced divers. I'm sure there are some that are just plain lummoxes as well.
I know several divers who have just started and are all ready talking about DM, Instructor, etc. While shops and Course Directors may encourage this for their own reasons, the several people I know are motivated more, I think, by love of the sport and the dream of diving every day and being paid for it than anything else. Sure, they need a reality check, but when the means are held out before them, and the dream (or 10m narcosis) stirs in their minds it's possible that their passion get the better of them.
Admittedly, I too would like to earn an instructor's rating...someday. I, however, want to be a GOOD instructor, so am trying to build up my experience and skills as well as learning new skills which would make me more proficient and hireable (as a part timer I think).
Without reopeneing various cans of worms that have recently been bouncing around the board, perhaps if more stringent standards were applied to those wishing to be professionals, there would be less people applying. I guess that's the crux of the matter, and an age old gripe on many levels: agencies v. marketing v. proficiency.
For many, it's tough to get a lot of diving experience, however they have the pro dream. By making it easier to achieve the dream, certifiers have increased the number of poor products (pros) on the market. In the end, I suppose it's up to the operators to screen the wheat from the chaff. I wouldn't want my friend Mr. X, working for my dive shop leading recreational divers on my insurance. Ms. Y, however might (in a few years) be a welcome addition. Just because everyone is a "DM," doesn't mean they will all be working (thank goodness!).