When it comes to the few professional and gifted artistes we have, I am actually more tolerant than the OP. With the emphasis on improvisation in CM, I do not mind the occasional slip provided it is not too jarring or embarrassing. What I find disappointing is the all too prevalent ineptitude when it comes to voice production, negotiation of high pitched notes, tonal quality, and overall aesthetics. Shouting, screeching, humming, nasal tone, and otherwise unpleasant singing is brushed under the carpet in the name of vidwat, acquired taste and whatnot. CM is not a nascent art form for heavens sake! There have been enough vocally resplendent singers over the decades who have shown the way!
EVERY major sabha bar none, has a good chunk of moonlighting amateurs who really do not have the vocal resources to be singing in public, let alone in primetime concerts. EVERY major sabha bar none, every year presents way too many concerts that are unlistenable, as is evident from the near-empty halls that are common for some singers who have lost it vocally, or never had it to begin with. Some totally unlistenable singers, with the connivance of the organisers sing to an empty hall barring a handful of family members and friends. They don't care as long as they get their name on enough season schedules, their NRI students and sponsors are not going to be any wiser!
Forget about identifying and grooming new talent etc., if sabhas just stop propping up the embarrassments, CM will get a well-deserved facelift!