FNG here. Sorry to make this my first post, but I think I have a rather interesting perspective on this topic. I started off in CB, then decided to jump into GMRS. I've had a GMRS license for over a year now. Yes, Randy was an influence in it, and I am one of the 162,000 subscribers to his channel, but there's things about GMRS I wish I knew more about and would've appreciated more info on via popular internet like Randy's YouTube channel. I'm still learning, and discovered things in this forum I didn't know I didn't know about. That's a different convo.
How to get younger people involved in radio communications might have the answer in HAM that I'm not seeing much in GMRS -- contesting. Kids love to play games, and they love digital electronics. If there's a way to demonstrate a form of contesting while utilizing remote control like a tablet, they'd be in it. Start off by demonstrating in schools. A fox hunt, or something like POTA where they communicate with other kids at schools in their town (high school level?), etc might be exciting enough.
Utilizing simplex, GMRS is dead. Many of you may not like hearing it, but that's been my experience. I recently moved from San Diego, CA to Pensacola, FL. I have both GMRS and CB in my truck. Utilizing scan on both, I didn't hear a single convo on my GMRS radio. There was the occasional noise on CB, and I engaged in 1 convo in East Texas. That was only because the people rag chewing for several miles specifically mentioned my vehicle as I was passing them, so I broke in and conversed. My younger son was impressed. My older son, a teenager, didn't care, which surprised me because he's into computers and electronics.
Moving to Pensacola, FL has been beneficial to me. The Five Flags Ham Radio Club teaches a course at Pensacola State College to train people to be Hams, even though they don't get paid. The course fee is under $30 for a whole semester, which goes completely to the college, and the explain and demonstrate the how and why of Ham radio. These are older guys who have been in Ham Radio for decades, and a couple of the instructors are electrical engineers. Through them I've found out the little Q+A Ham Radio book has several wrong answers, which is causing people to fail the Technician test because they studied/memorized the wrong answers. I can list specific questions if people want. The larger spiral bound handbook has the correct answers in the back of the book. These instructors do not like "sad hams", and question their claim of superiority when they're typing 50wpm CW instead of doing it by hand (citing "an accent" that can be heard when CW is done by hand on a paddle). Their excitement for Ham Radio is infectious, with over a dozen students in the class. It's a shame they don't share they same passion for GMRS. These instructors are the life blood of Escambia County, Florida's ARES program, and done are even involved in Search & Rescue. One of the things they constantly preech is they do the course do they can get people ready to replace them.
Btw, one of the things that irritates me about the Ham Technician test is the amount of questions I'm studying in titration to the number of questions they'll be on the test. There's over 420 questions, but only 35 of them will randomly be on the test. Kids don't want that. That's too much studying for something people think should be fun. It's not fun if you're working. At that point it's work, so they won't enjoy it. GMRS had an advantage over Ham on that. Another issue is the process of getting the license. Government websites are not quick to navigate through. And, the license costs money. They don't want to pay their student loan debt. What makes anybody think the kids will want to pay for it?
If you've read this far, thank you, and I'm sorry. Cliff note version: the process for getting a GMRS license is contrary to what kids want to do.