Graal and Truffle are cool. It's unfortunate that it's in Java, mostly because I don't trust Oracle to do the right thing with the community and I expect them to change licenses to make business opportunities for Substrate VM licensing.
That said: I agree it seems extremely likely at this point that Oracle is going to milk Substrate for enterprise money, and that's a shame because it is a really important component of the system, in my opinion. And not having it will be a big drag for people who are considering Truffle/Graal.
As such, what's concerns still exist?
http://www.infoworld.com/article/3217347/java/oracle-doesnt-...