Prof C, I hear that. How many groups actually manage to stay together, with their membership intact, for more than a couple of years? Sure, there are some, but, I'm going to guess that they're at one end of the curve and not the average. There's a reason WOTC's market research said the average campaign lasts about a year. And, taking it with a large dose of sale, poll after poll here at En World shows that most groups don't maintain their membership for more than a year or so.
My current group has three of us who've been together for 4 years, one who's been with use for two years and one who just went over a year. And none of us show signs of group fade. There's no foreseeable reason we won't be gaming together for the next four or five years.
I think people who have stable lives and stable gaming groups really don't realize how incredibly difficult it can be for a lot of people to get a group together.
Heck, I listen to Fear the Boot regularly, as an anecdote. Their gaming groups regularly implode. In the three or so years I've been listening, they've had numerous line ups in their campaigns.
People are busy. It can be very hard to find five people who share your interest in gaming and your schedule. Great when it happens, but, more often than not, a lot of people are forced to either not game or game with people they may not actually mesh with so well simply because of life pressures and geography.