WHAT? Hey mate, I think you are a bit off base here.
I know many many athletes and bodybuilders who have maintained Anabolic Androgenic Steroids (AAS) augmented size and strenth for upto 30 years after they stopped cycling. Some have remained on HRT to keep a high normal (under 1000 ng/dl) level of test in the body, but believe me they are still big and strong, much more so than they ever would have been without using AAS. Some gains are temporary due to the extra h2o, glucose, etc. while cycling, but all your new muscle is not simply going to disappear once a cycle is over (with proper PCT) if you continue with proper diet and training. And, if you have a good foundation of natural training, you will keep even more gains.
For instance, in my mid 20's I weighted about 170 lbs after 3-4 years of dedicated natural training. I eventually worked my way up to a sold 240 lbs (at 12% bf) in the early 1990's after cycling a range of compounds. I lost some interest in training after an injury and was only able to lift 2 days/week max for the next 6 years in the mid-late 1990's, while I was completing my graduate education. Even so, my weight stabalized at 205 (14%). And this is with minimal training - If I had been more dedicated to training, who knows. Now, in my 40's, I'm working on bringing my lean wt up a bit and plan to run a few compounds (after 10 years Anabolic Androgenic Steroids (AAS) free).
Obviously, you will waste away if you are completely sedentary (which I was not) and have a terrible diet (which I did not), or over train or starve away your gains on a low carb (or other fad) diet; but, otherwise a good deal of the gains should stay with you.
In my opnion, individuals not able to keep at least 30% of their gains in mass and strength after a 10 - 14 wk cycle are doing something wrong! For one thing, they are probably confusing water retention with real tissue gains. This may not apply to a few rare genetically small/skinny bros (or to very high level athletes who are way above their genetic limit), but this applys to anyone with average genetics (like myself) or better.
Cheers --