More (I presume) serious adult model builders. This results in more of everything for everybody:
1. More new kits and accessory parts that are accurate and detailed as well as more variety in subject matter
2. More online resources, from model car websites/forums as well as reference material for production vehicles and race cars/modified vehicles from today and the past; plus, more art of fantasy and phantom vehicles that can provide inspiration (or ridicule about what doesn't "work")
3. Useful tools, often from fields that modelers haven't known about or haven't had access to
4. More venues to show our work, from non-competition displays to contests that cater from "everyday" good modelers to the amazing best-of-the-best craftsmen
So, essentially, I'm repeating what you wrote.