Isn't that the exact strategy followed by Sun? Being open and fostering a community sure didn't translate into sales for them.

The message Oracle wants to send is pretty clear: if you want to use Java in the mobile and enterprise space, you're going to have to buy one of our very nice support contracts. Considering that this is par for the course for most enterprise platforms and mobile (until Google wrote Dalvik), why would previous licensees make the costly decision to switch?