I think it's a good idea, although I'm concerned that I'm no longer classed as being young and will be "sacked" on my up and coming 25th birthday!
On a serious note, however, I do think this is a good idea. I'm forming a creative network in Yorkshire for young designers, focused on the graphics industry, based on a model I was involved with in my previous home town of Edinburgh. We're probably going to be targeting a slightly wider audience in that we're holding events for under 30s, as well as displaying the work of those in the Yorkshire and Humber regions via our website. We'll also be posting video and pod casts to encourage a community feel. However, please don't feel put out if you're outside this area! I just happen to be new to Leeds and feel there's not enough support out there for new creatives.
Still in the early stages but it's good to see others initiating similar models as unfortunately one size doesn't fit all and people want choice, so why not set up more similar style groups?
I for one think YCN is great. However, it is quite London-focused.