I'm not sure you could merge GF and WLS from a commercial stand-point. I believe the customer groups are quite different.
Integrating Oracle app server and WLS was much easier in that regards, they both had a closed-source license + support business model.
I think it's quite a bit more difficult to reconsile GF + WLS, I basically see two approaches:
* Create two offerings one that is cheap / open source "low-end" and the other closed source "high-end" and let them live separate lives
* Merge GF + WLS, though I don't see too much that GF can contribute that WLS doesn't already have ( at least in GF 2.X , GF 3 might have something to contribute, but I'm not sure exactly what it would be). Have two WLS offerings (as today) high / low end
Either way they need to create enough differentiators between the offerings to not cannibalize sales which makes the first approach as bad as the next I'm afraid.
The sad part is that if GF had a year or two more to build a community, it might have had enough traction to continue, now I'm not too optimistic unfortunately :(
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