And sooner or later you will have to update to Lion, so why wait?
That's just one way to look at it.
While it's true that Lion will be the sole version of OS X going forward, that in no way is an indicator that it's better for all users.
I've spent quite some time optimizing 10.6.8, and its ideal for me.
In addition because I tend to be an early adopter, I took a slightly different approach. Always one to be Pro-Apple and eager to experience their latest, I bought a new 13" Lion equipped MBA.
This allows me to have the best possible Lion experience since it's sure to have the appropriate combination of hardware & software direct from Apple. My take on Lion? It's not bad, yet there are "features" that I find annoying, that I don't need, and that even when turned off or ignored, still have a negative impact on my work flow.
Am I condemning Lion? Absolutely not.
As an individual who's computer use is as a professional in a demanding work environment, speed and efficiency are paramount. Therefore I'm not inclined to jump on the bandwagon just because Apples anointed Lion as "The Greatest". What I have now is the fastest & best solution for my requirements.
For those with different needs I can see where Lion is the best for them. I'm not one that has to "be right" to be happy or effective. Nor do I bash a product because it may not fit my current needs.
Finally, I wouldn't be surprised that as Apple has more time to work on future revs, that it may end up being just right for me. That's one aspect of Apple I like and why I've remained loyal for two decades. Apple is a company that continues to refine and improve.