In January of 2241, the first samples of jet begin to arrive in Redding, courtesy of the Mordino family. So if that's why there should be no antidote then there should be no jet as well.
Then everything is fine as it is. Who wants Jet, get's Jet. Who does not want Jet, simply doesn't get Jet. I do not see a big Deal with it.
Nothing more needs to be said about this. Your Fault, your Problem. Over.
Tho in the pipboy it says its 2246
I didn't mention Guardians just because they represent no real force in my opinion.
I hope we will see some sort of antidote (lesser ones, maybe, curing jet craving for a week etc.) in near future. Permanent jet addiction is unnecessary feature if you ask me.
Make it like Vampirism or Corprus in Morrowind, once cured, can't be achieved, so if you by mistake took one dose of Jet and then discovered it's forever, you getting Jet Antidote by some way, may be even not repeatable quest, and then, after taking this antidote it cures your Jet addiction and makes taking Jet in future has no effect on you, so you cutting off your character from this drug forever, but also don't suffer from addiction.