On the contrary Vringo needs Worlds. In my opinion Vringo adds value in its legal expertise and its trading status. Adding Worlds would bring a new spotlight on the litigation front and open up more potential software targets.
I see it the other way around; WDDD could benefit from the services of VRNG, patent protection is part of their business after all. I'm more interested in what's being developed. I see the whole patent business as a means to pay the bills, like an artist does the 9-5 routine while perfecting his or craft, and building a name. I think Lang has interests in other technologies. Isreal seems to be leading the way in cold fussion, and quantum physics with things like levitation (see trapping for some "cool" examples). VRNG has a presence in that geography, a vehicle to absorb, and represent new innovation, an interest in new technology, and in Lang's case a history of innovating, and implementing tech. They mentioned a new wireless energy patent, I want to know more about it, are they picking up where Tesla left off? Is overunity under the microscope, either as a cold fussion process, or other means? I think the biggest parts of VRNG are yet unseen, and patent litigation is just a way to fund future projects.
Vringo paid over 31 Million US for 500 Patents from Nokia. They only keep a fraction of the profits of any of this inforcement. I do not have the exact figures. Worlds has 5 Patents (core) that would be of the greatest value. The reason this is attractive is the Worlds patents are far reaching in scope. That value could be over 100 million or more. Keep in mind Google paid Yahoo 1% of their Market Cap in 2003 for 1 patent.