As for tango addicts...

... I believe that the stage of addiction is absolutely necessary if one is to become a good tango dancer. And the longer it lasts, the better.. I suppose everyone emerges from it, eventually, because it IS rather exhausting in the long run; but it is something one simply has to go through, no matter how nutty it may seem from an outsider´s point of view. Or, as a friend of mine, a much more experienced tanguera, once put it: ´In tango, you have two kinds of people. There are those who take classes, but rarely go out dancing because it is too time-consuming / exhausting if one has to work the morning after, etc.. - these people go to advanced classes and know many figures, but they never become REALLY good dancers. And then you have those who become hooked and dance like crazy, hardly ever miss a milonga and stay out late although they have to work in the morning - and these eventually become very good dancers.´
Basically it just boils down to whether you adapt tango to your life or your life to tango. And in case someone finds that way-out, I would like to point out that there are tango dancers who simply cannot understand how someone can NOT dance.. It all depends on perspective.
Like I said, however, one is bound to sober up eventually and take dancing easy, ideally content with one´s technique and becoming one of those cool, self-possessed and lofty dancers you sometimes see at milongas, who apparently no longer feel the urge to dance or will only do so for special occasions or partners. But I wouldn´t know, would I, being still a happy addict myself..
I have a private theory about the next and ultimate stage of dancing the tango, a sort of a dancer´s nirvana: the individuals who reach it no longer NEED to dance in order to experience the ecstasy of a perfect tango; the man and the woman simply look at each other and in the split second when their eyes meet, they KNOW what it would be like, they experience between the two of them a perfection beyond the imaginable and the feeling in itself is so intense that there is no need to go through the whole exercise physically; they just sigh contentedly and lean back to recover from it. I have not so far met any such individuals, but of course they would be very rare. Which is lucky, as an abundance of such illuminated tangueros would make milongas extremely dull for everyone else.