The main reason VPLM will sell the co is because they do not have the resources to enforce the patents or build out the business. No matter the reward of doing so, it would require additional dilution or taking on massive debt (if possible). Neither the BOD or the shareholders are interested in that path. Further, any CEO of a major is not going to be worried about what happens in some legal case 5-7 yrs from now because his bonuses and options, etc are based on the here and now. He/she would leave that problem for some future CEO.
That being said, they will make offers, but it will not be for the true value of the company. It will be far lesser because of the point I mentioned above. They will want it, but they will want it at the least possible price. Still, since there will enormous competition for the technology coupled with the fact that the competition will have the capacity to enforce the patents, we will still see a very valuable buyout in the near future (multi B). JMHO