Great post, 100 percent, media shapes our thoughts and culture to a large degree, although I wouldn't say Hollywood is 'urbanist'- it does use attractive urban settings heavily. There's a whole avenue of thought to explore about how a big swath of pro-urbanites are lured in by a dream sold to them by movies and TV.
I know it definitely influenced me. I hate metropoles, never been to the US, but shows like Friends, HIMYM and Seinfeld made NYC look soooo cool.
It makes me long to see a city I rationally know I'll hate, and yet I'd have videos of people walking or cycling or straight up riding the subway in the NYC on in the background sometimes. And that allure then also extends to big cities in general. It's just that feeling of "the big city, so many opportunities, such a rich life". Even though a lot of those sitcoms mainly take place in only a handful locations (the [usually] two apartments of the protagonists and the bar or cafe the protagonists hang out in, and minor locations depending on plot) the amount of quirky adventures the protagonists have makes it all extremely appealing, because real life is exceptionally dull compared to the 20 minutes of sitcom life, obviously.
I think there are kinda two archetypes of sitcoms. The "Young Hot Urban People fucking around" type (Friends, HIMYM, Seinfeld [ok, not that young...], New Girl, Two Broke Girls, Big Bang Theory...) appealing more to the teen to mid 20s demographic, and the "Surburban or rural family being hilarious in their house" type (Married with Children, Roseanne, Home Improvement, Modern Family, Unhappily ever After) appealing to both the younger and older demographics.
Or, instead of "appealing to" it's more like "being more relatable to".
Btw., now that I think about it, most of the "family sitcoms" I listed are from the 90s aside from Modern Family, while the "Hot Urban" ones are more often from the 2000s and later. Am I just missing the more modern "family" ones? Or was there a bit of a shift in what was produced more?
Anyway, it really is fascinating how much TV shaped the perception of "the big city", and I do absolutely believe that this is what a lot of urbanists, especially those who don't actually live in cities, influenced.
I'm gonna take a week off from work and write down a dissertation in "Critical Media Studies" or some other inane bullshit studies on this topic. Easiest PhD ever.