It's not necessarily a good idea to merge them
I don't recall, offhand, the performance characteristics of JRockit and HotSpot, but I have a feeling that the former is optimized for server use and the latter for client apps such as browsers. If so, it would make more sense to keep them separate. It's a key rule of engineering that you can't optimize for more than one variable at a time. To put it in everyday terms, if you already have a Ferrari and a pickup truck, you'd be very unwise to try to create a compromise between them.


