I didn't do 2,000 squats, but I was 5-9 in high school and was just barely able to dunk, maybe one out of ten times I tried. Most of the time I'd lose the ball going up, swing my legs out while holding the rim, and fall on the back of my head.
Yes it maybe possible to increase your vertical leap that way.
Spud Webb former NBA guard was about 5'6" and won the slam dunk contest some years ago. Nate Robinson a small guard for the NY Knicks won the dunk contest again recently.
http://www.youtube.com/watch?v=W1pykLK_CUs
http://www.youtube.com/watch?v=xWcrR7OcRRA