How would you describe the "average" climber?
Average is relative to the location and the people who surround you.  In places like SLC, Boulder, So Cal, and other places with great gyms and local climbing it seems like the average person climbs at least V7 and 5.12!  

How has this person changed in the last ten years?
Ten years ago, there was one gym in SLC to hone your skills.  Now the average climber can choose from two guide services, three gyms, and at least six recreation centers.  The average climber has better gear and more places to use it inside and outside.  

What's the best city to live in if you're a sport-climber?
That’s a bit of a loaded question.  You know I have to choose SLC being a local boy.  Here’s why in terms of location alone

LCC:  Great trad and bouldering on solid granite 2 minutes from my house

BCC:  descent trad and sport on good quartzite 10 minutes

American Fork:  (Yes this is a benefit) Good limestone 38 minutes

Maple:  Great conglomerate 1 hour 45 minutes

I didn’t even mention all the great places that are anywhere from a 3-6 hour drive.