I don't think the player base needs to expand but rather attitudes toward it be more open-minded and accepting that it's just another hobby/pastime/recreation that its players are very passionate and enthusiastic about and one that helps their wellbeing in keeping them active.
Going to the gym is good for people's wellbeing also but when you hear about steroid and other PED use or the steroid user (plus gym "influencers") behaving in disagreeable way, exercising at the gym isn't villified and denounced because of one or a few bad apples the way airsoft in the UK would be, nor would exercising at the gym fall under the same scrutiny.
I couldn't agree more about the concern that becoming too big will attract mouth breathers. Look at F1. A few years back, it was popular but in only so many people's conversations. Thanks to Drive to Survive and F1's commercial rights holders pushing it to be more mainstream, it's much bigger with a new breed of fans who have taken the lustre off the sport because of their tribal behaviour bringing the handbags out at dawn.
I'd rather not have a celebrity or "influencer" push airsoft because it would be another flavour of the month with new players dicking about, harming the reputation of regulars who take safe, honest and responsible play seriously.
Justin Bieber, David Beckham
I rest my case. I don't consider Bieber as much of a prick now but he's not exactly a shining endorsement for airsoft. Beckham is an entitled self-loving brat who got salty about being ineligible for a knighthood because of his tax dodging then he made me even
less inclined to consider visiting Qatar when he promoted it for the last World Cup.