Articles like this make me believe that Java should have just gone with a model designed around fibers that each fiber gets a fiber-local heap and objects that survive the death of the heap or are accessed in a multi-fiber way are moved to a global heap.

It would solve the problem with "stop the world" GC dynamics and increase concurrent collecting performance while also adding native fibers to the JVM (and thus make it possible to write highly concurrent software in Java much more easy).