savvy - 3:30 am on May 27, 2010 (gmt 0)
I was actually thinking this morning that if it were me I would probably look at splitting it also.
You can't make changes to the current site without losing the old timers but you can get new people/ideas in without making changes.
Have one site which uses totally new ideas and social networking, allow links and run it with ads and then have another site like this.
The only other thought I had would be to slowly introduce changes in stages so as not to upset the oldies :)