So there are patent defense companies like Allied Security Trust, RPX and the Open Invention Network but it seems like these are for major players and/or have v

So there are patent defense companies like Allied Security Trust, RPX and the Open Invention Network but it seems like these are for major players and/or have very limited scopes. Is there anything similar out there for smaller businesses, particularly for those in the software industry? Wouldn't it be nice to have an Open Invention Network type entity that can build up an arsenal to defend against these types of existential threats? I could see paying a monthly 'licensing and services' premium that would go toward maintaining a patent portfolio, retaining defensive legal services and maintaining a database of prior art and other useful information that can be brought to bear in these kinds of situations. I know there is regular patent insurance (I have never used it) but it seems more offensive rather than defensive in nature and is expensive.