About those who have visitors who play once or twice then can't be bothered...
Basic default settings on pinball machines are way, way, way too hard (or difficult to understand) for most novices, so it does not hook them in. This causes them to loose interest as (in their eyes) far there's far more interesting things to be doing without the effort required to understand what to do.
For example I took Batman TDK and Avatar to a comic-con in Salisbury in 2019. On the standard settings a few people that played managed 1 ball then wandered off having lost interest (too hard). I changed the settings to extra easy on everything, for example on Avatar - 1 hit on the Amp suit drop targets, they go down, second hit on Amp suit starts multiball, first ball in to link locks the ball, next hit on the locked ball starts link multiball. Then people were staying for 3 balls and 1 or 2 were beginning to enjoy the games enough to get be classed as beginning to getting hooked on them.
It's a big problem for SWL - we have many one time visitors just to try out pinball as an activity. The games are set too hard so we tend not to see most of them again, unfortunately (games have to be set hard so the regulars don't rack up massive ball times preventing anyone else from playing them). The people we do see again are those who can already play pinball and like the challenge. Many people in pinball don't realise the difference in settings as we take for granted what is in front of us and adapt. When I played local pinball on site back in the 90's there was a Dr Who machine that I could easily put 1.5B on without too much trouble. Playing a Dr Who machine again 10-15 years later in the league/South Coast Slam, I was struggling to get above 30M to start with, before realising it was down to the settings of the machine and I had to figure out how to improve my play in order to get a decent score.
Oh, and pinball has plenty of life remaining, even if it dies a death in the UK (because we've grown too old or whatever). The rest of the world would step up and buy the machines when they became affordable, which will be when the price drops too low.