On a midterm some dissagreements between Oralce's product strategie and other JCP members' ideas could lead to problems. Of course, there is always a lot of politics in it. And I believe, that his will not be easy, if the JCP is lead by a company making money of it's products. To me, this seems as if it is not the biggest problem to others while Sun has the lead. I'll expect this to change. And this probably even leads to a redesign of the JCP in general.
Up to now, it is in your own hands to build your oppinion about all this. Some actuall blogposts around the future of Java, Sun, Oracle and discussions about the famous Larry Ellison quote "Java speaks for itself." are around. Take a look:
Kevin Farnham "Does Java "Speak for Itself"?
Discussion Forum about this quote
Recent poll on Java.net (one third "has it's doubts")
Thoughts from Bert Ertmann
Cay Hostmann about OpenWorld