In order for OpenSolaris to do well, here's an article that points to IDC's assessment on what it will take to really be an effective force in the open source world.
Here's a quote:
Sun could establish a strong community
So, in order for OpenSolaris to do well, it needs to follow what Java technology has done. That's the ticket! Easy downloads, online docs, big conferences in San Francisco (with a video gamers lounge), and a Micro Edition that fits on cell phones. Wait-a-minute... Solaris on a cell phone... Hm... If I only had dtrace right now on the J2ME phone I'm working on! That would be cool! :-)