I suspect this will be a well followed topic Gander. Hopefully the toys will still be on elastics in their pram at the end of it.
I should say I can only comment on the wider topic from outside the competition scene as it's not an area I understand at all. Locally we're lucky in having a very open and dynamic social life, where fishing is just like a thread which weaves its' way in and out of a much more detailed life of shared activities. I've been to more parties, BBQs, and the like since I moved away from London. However I'd be surprised if one of the wives didn't come up to any 'grupetto' of chatting blokes and (correctly) say 'you're not talking fishing again are you?'. The stock response is something like 'no, mortgages' or a similar but obvious lie

.
I think what the forum and conclave idea promotes is the breaking down of barriers, the opening up of what could be quite cliquey groups and adding a sense of belonging to a wider fraternity. It also adds the possibility of going fishing where I'd never have had the confidence or knowledge to do before and meeting people to whom I'd previously have just said a simple hello on the bank or shore.
Except when boat fishing I still fish alone by the water, even when I go with a group, but I'll make sure I bring the camera so I can take a photo of the fish, I wouldn't have bothered without the internet. In the back of my mind is the possibility of catching something inspirational others will be able to see and go 'fair play to him, I hope I catch something that nice next time' or just admire for the sheer beauty of the fish or scene. There's also the aspiration of tying a fly which works, looks good enough to share with others and improve with their feedback. I'm less likely to buy a **** piece of tackle now as it'll be up here or advised against if I ask. I also have a longer term view of persisting with the fly in other areas such as the sea and estuary.
As long as the handbags don't keep coming out, I don't know if forum activity will lessen the activity on the water for competitions. If anything it will bring it to more people and lure the poor buggers into having a go. After all now those who would never have guessed such an aspect of the sport existed will see it. I would caution against having hissy-fit sessions as they had recently, but it's a new aspect to their sport so maybe the etiquette is just bedding-down.
I've learned much more about conservation efforts and issues affecting our sport than I could have from the mags, they just don't give the feedback in the same way. This has led me to being much more active in trying to help out locally.
No single conclusion here, but it's definitely been a very positive influence on my fishing so far.