The classic joke people in recovery tell is about two friends who meet and have this exchange:
"Did you hear about Jim? He's going to Alcoholics Anonymous ..."
"How sad ..."
OK, what's wrong with that picture? Jim is finally quitting a self-destructive behavior that was killing him and is taking a positive step to save his life. The informed response is, "Good for him."
the question "would you support his recovery or expect him to hit the party circuit" is a no-brainer. You support him; the other choice is like handing him the keys to a car with worn out brakes and sending him up the mountain for the morning paper.
About 20 yrs ago one of my best friends went into a program. I soon had lots of new friends who were recovering alcoholics (they will tell you they are always "recovering", that it's a lifetime commitment, not a one-time decision.) For the record, I've never met anyone who was in AA who, after that first 6 months or year and getting stable in their sobriety, didn't encourage me to have a glass of wine or whatever when we're at dinner, etc. At the same time, few people in recovery will want to spend a lot of time with a group or an individual who overdoes it, especially habitually. Again, they are talking life and death.
As others have noted, though, the first 6 months-year of sobriety is touch and go. 12-step programs advise avoiding any serious relationship. A date, probably no big deal. But this is a huge transition period, and the person is finding his/ her way, and rediscovering how to live in the world without the thing that was both killing him and had become his mechanism for getting through life.
To answer the original question:
Hell, yes, I'd date someone in recovery (though not likely in those first months). I'd much rather be with someone who's in a program than someone who needs to be ... And if I were with someone already who then entered a program, I'd support it all the way. And if my boyfriend developed a cholesterol problem or diabetes, I'd deal with that and support his health. But if you are determined to drink and drug like there's no tomorrow, don't worry that his needs will slow you down - worry that your needs will subvert his life-saving change. If you're concerned that dating a sober guy will kill your social life or fun, then do him a favor and give him up.
Anyone in recovery will tell you, getting sober itself doesn't make a person "better" or "smarter" or wiser. So I close with another AA joke I've heard:
You can take the booze out of a fruitcake - it's still a fruitcake.