I honestly think it's becoming more mainstream. Not long after the PHB came out, I was in bar in downtown Ottawa, and overheard at least three separate conversations mentioning "5th edition" and "D&D". Granted, this was a trendy dive with a youthful clientele, but I'm not sure how much that would affect it; people of that age are usually more guarded about their personalities, more desperate to appear "cool".
I think, as a general rule, anything that smart, nerdy kids do is going to become more acceptable thirty years later, because people in positions of power are more likely than not to have been smart, nerdy kids or to have had friends who were.
When I was in high school, I think I was one of about six kids who played roleplaying games. Then I went to a good college, and it was like 10%. Then I went to grad school, and it was like 20%. Now I live in a community swirling with elite-educated lawyers, investment bankers, consultants, government officials, and military officers, and in that world D&D experience (if not regular gaming) is present in at least 30% of the people I know.
Expand the group to include either RPGs, Game of Thrones, Harry Potter, Star Wars, or Overly Complicated Board Games, and you're probably looking at 70-80% of the elite professional population. Hell, the President of the United States is a nerd.
I've been out of the basement for a while now, and it's not been a problem at all. OP's doctor sounds as out of touch as the Old Economy Steves who don't understand why millennials hop from job to job rather than grind out their lives at a single corporation that will show precisely zero reciprocal loyalty toward them.
(I would also note that every other profession is cracking up right now at the idea that med students are too cool to play D&D.)