Well, yes and no. (I know you're baiting, but what the hell...)
Him having his dream job, does not necessarily equate to financial security. And believe me, this I know, if he's going to be in the field of Research, he is not going to do well financially. I know it sounds good, and people equate smart to rich, but it is a long path in science (Undergrad, PhD, Post Doc) before you can even THINK about applying for your own grants and even longer to get tenure at a university. OR, he could do all that and get a job in the biotech field, but how long do you think he'd last at Pfizer if he were missing deadlines all the time?
Nor does it necessarily equate to being a set career. In fact, unless it's superhero related, there will be a lot of conflict because of him leabing his job when emergencies arise. And again, if he's involved in Research, he's at the whim of Grants, which tend to run about 2-5 years. His field has no stability.
And I would say that there a lot of people who have yet to "grow up" who have perfectly respectable jobs (why is it lawyer comes to mind when I write this.) Or put it this way, I think you're much more likely to find a 20-something single lawyer out on the town on a friday night, than you are your typical married with children guy. I mean, seriously, if you had a friend who was married and had kids, and you weren't, and he was hanging out with you all the time: golfing, bar crawls, mountain biking, etc; wouldn't there come a point where even you would be thinking "Dude, shouldn't you be at home with your kids?"