It's a mixed bag. The online airsoft community has fragmented, badly, with a very negative effect on the game in this country. When I started to get interested (in the mid-2000s) the airsoft forum was king. The knowledge base, the classifieds, the social side - it was all indexed in neat categories, you could search, and you could post in appropriate topics. The gradual drift to Facebook has gutted the forums, and now everyone's trying to extract information from chaotic feeds with anteretrograde amnesia. Those forums kept weird, esoteric knowledge alive and accessible to everyone; the loss of AirsoftMechanics and GasGuns alone let hundreds of thousands of knowledgeable posts evaporate into thin air. It's not just the tech guides and reviews - the ability to organise games and meet players has gone. Some of my closest friends I met originally on Arnie's, a storied forum that's now lucky to see a couple of posts a day. The last post on UKAZ, which while never exactly ZeroIn was a heavily-trafficked site back in the day, is entitled "What happened to this forum?"
The tech situation is also pretty mixed. On the one hand we have much more advanced tech - FCUs, Recoil Shocks, solenoid engines, better GBBRs, better shotguns and so much more - and a far broader range of guns that are much better built than back when I started. Today £300 buys you a full-steel AK with high-quality internals, not a largely plastic gun that will explode above 1.1J, and £100 buys you high quality pistols in a broad range of models. On the other hand, this tech simply isn't being used: it's insane that the overwhelming majority of airsoft guns sold today are still straight clones of a gun that debuted the same year as the original PlayStation. It's really disappointing that it's taking manufacturers so long to bring improved designs to market; so much potential is going to waste selling the same M4 in 10,000 different colour schemes.
Airsoft's not peaked yet, IMO, but it's definitely gone steeply downhill in some respects.