In reply to sphagnum:
Once a sport or activity has become relatively popular, general standard will always be fairly low as most people aren't very good compared to the best. That said, nowadays the number of folk climbing mid-grade routes (IV-VI) has increased hugely, and really you could say the same, relatively speaking, for the higher grades. My guess is that now general standard and competency levels will stay about the same.
It's really hard to compare with the early days - general standard then was higher but that's only because less people were involved and proportionally more of those who were were decent.