There's nothing wrong a viral idea, and there's nothing wrong with admitting that an idea is viral.
Your comment made me think of what first attracted me to the Free Software world. To any one who's discovered the elegant beauty of Darwin's evolutionary theory, there is an equal attractiveness in the way the GPL license is framed.
The very fact that the GPL attaches itself to the code its released under, and survives into the downstream modifications that are made to the code.. there are beautiful resemblances to the way successful life itself evolves.
I'm inclined to believe that licenses that are not viral (e.g. BSD) and depend on altruistic reasons to survive, are somehow doomed to extinction (i.e. will be swallowed by proprietary licenses that couldn't care less about perpetuating the BSD cause). In the long run, the GPL will emerge as the fitter license that made its way into the larger user base while retaining pefect copies of itself.
(Of course I'm neither a biologist nor a programmer, so apologies if I sound like I'm talking outta my ass.)
