Every style is spoiled, or will be eventually anyway. It doesn't mean that there is less good music though.
When a style becomes popluar and a load of talentless cretins try to get in on it and release 99% crap, yeah most of the music is shitty but with all these hacks there inevitably come the 1% genius artists and the bigger the style gets the more artists there will be in this top percentile. The good stuff will become more & more however the bad stuff will still swamp it and it can be annoyingly difficult to find the gems.