Part of, if not THE issue is younger generations want it now, and wont take the time away from their phones and social media to learn to build. For many, building a plane and then flying it is what makes the hobby. Whats really sad is that technology today makes it possible to do things with our models that was impossible a couple decades ago due to weight. Full on lighting systems, GPS, easy train systems etc. are a few of the things not possible back then. Mini and micro servos for gear doors, bomb bay doors, and rack systems for realistic bomb drops were not possible back then, but look what can be done now. Heck we even have printers to make parts that were hard to get if they were even available like special hinges and such.

Between lack of interest to build and lack of available flying fields, it wont be long before the days of bringing something special to life are gone.