I had a different background, but had many electronics kits in my pre-teen and teen years like you. I started working in a TV repair shop when I was 13 starting sweeping floors and staying there through college pretty much running the place (8 yrs total). After I graduated I went off into industry designing electromagnetic tachometry, then to Sunair Electronics http://sunairholdingsllc.com/ doing R&D on one of their military HF radio designs, and then into professional public safety communications for the last 22 years starting with doing covert electronics for our organized crime and SWAT teams and now managing a PS radio system. I also do personal communication consulting as well, but the market hasn't been that good for the smaller agencies that I have assisted in the past. I was licensed in '91 and like to help others using the diverse experience that I have gained in the industry. As to your question on who will replace those who go away....it's hard to say, but being that wireless/amateur communications is becoming more "digital", maybe those who have those types of interests.