I'm living proof.
I used for over 7 years and was on for 3 years straight when i decided to quit. After 8 months my free and total test were on the low side of normal and 2 years after i quit my ranges had moved up to what my doctor considered completely normal for someone in their early 30's.
Everyone is different, but i have seen with my own eyes how a person can regain their natural test production. I wake up with a screaming boner every morning and i can bust a nut 5 times a day no problem and i haven't touched AAS in over 4 years.
It can be done, the only lingering effects i have are nagging injuries and fucked up disks in my back from years of hardcore powerlifting.
j-hawks post just above is very true. In a few years every guy over 40 will be on test. We all know how money hungry the pharmacy industry and doctors are and this will just give them another way to make big money.