1. Yes, we used to cut ours down to a 2 ft ball every year right after they bloomed and they always came back full and lush and beautiful.
2. Probabaly..... but if not, definitely by the 2nd year.

I'd trim them soon though.

Dora

This is a good time to cut them back. The rule is after they bloom, but before August when the buds for next year are set. You may not get as good a bloom next year, but the following year should be fine. If they are over your head, I wouldn't take them down to two feet. I think the rule of thumb is to not take off more than a third at a time. So if they are 6 feet tall, take them down 2 feet to 4 feet, then next year you can take 1/3 of that. I don't think they will put on that much growth in one year.

Thanks for the advice. Hopefully in a couple weeks I will have taken back this part of my property!

I cut some back that were about 30 or 40 years old. They were about 5 feet tall. I cut them back to about 2 feet tall. They looked very scraggly for about 3 years, but are finally getting leafy again.

From an interview with Parker Andes from Callaway Gardens:

Pruning to Rejuvenate

"This is probably my favorite job," said Parker. "When an azalea is way too tall or badly misshapen, if I see vigorous growth at the base, I know I can make it look ten times better in a minute or two."

He demonstrated on an old azalea that resembled a leafy umbrella standing in the woods. There were several sprouts at the base, struggling to reach the sunshine blocked by the leaves above. With three cuts, the azalea went from six feet tall to eighteen inches high.

Here is a link that might be useful: Azaleas Summer Pruning

I have a hedge row of Kurume Azaleas on a NW street corner, that became overgrown, up to 7 ft. tall, with no foliage on the lower 4-5 ft.
Last June, I cut them down to 18", with nothing but bare stubs remaining. They are now covered with foliage and about half had numerous flowers this spring. I am expecting some flowers this fall, as they usually bloom twice each year.
During the severe freeze in January 1985, I had to cut the Southern Indicas off at ground level. All returned and grew to normal size within a few years.