All the features that should have made WebOS the best-selling platform ever have now been incorporated into the competing products. The fact that Windows Phone is basically WebOS with the homebrew taken out but is still lagging far behind in sales goes a long way towards showing that features matter much less than advertising and hype.
Not surprising, seeing as how Google hired the guy who designed the webOS UI, Matias Duarte, to lead Android UI development starting with ICS...
Disclaimer: I'm right now an intern at HP, but I'm first a Free Software hacktivist and user.
That's a healthy install base, and makes working on an open source OS for the device a worthwhile proposition.
From there, it will hopefully be a virtuous cycle, as people buy devices that can run WebOS because of a healthy developer community.
Now if you're in the market to do something new...