It "can" and "may" cease, but that doesn't mean it "will".
The guys in the 60's and 70's used crazy amounts for long periods as well, it's a myth that they just used for a few weeks before a show. What they did is use low doses year round and blast into the competition, that's why they always "grew" into the show.
Look at Arnold and the other top level guys, they did not come off.
Yes, they did come off. They only competed in one or two shows a year. Arnold looked small when off.
They'd go on for 6-12 weeks up to a show and then cycle off until the next run up to a show.
Of course there were some idiots who stayed on all the time, just like today. There are always idiots.
If you stay on all the time your nat test production will cease.
It may come back over time or it may not, or it may come back but never be the same.
Nobody stayed on all the time in the 60s and 70s. There was no need unless you were competing
Guys take special drugs to kickstart their testes back into production because they are dead.
If you are always on you are really an addict. You can't function without it. That's the definition of an addict. Even if it's a mental addiction.
You take the drug to feel good all the time and you never stop.
You go off and you feel like sh*t like an addict going through withdrawal. That sh*t feeling can last a LONG time...a year or more even.
So, you jump back on...like an addict getting a fix. Now, you feel good again. Like an addict.
"But it's for my quality of life." That is true if you are really someone with low nat test levels like Prime who is 75 or something but if you're 20-40 and staying on it 24/7/365 for an ego boost then you're just an addict. Without the drug you feel less of a man, Addiction.
Addicts always believe they can quit anytime. But they never do.