real problem in the patent field The real problem is not "patent troll"(no one can clearly define who is patent troll), The patent theft is the real problem.
It's the big companies refuse to respect and recognize other people's(specially small inventors and companies) inventions.
Take wilan as an example. Wilan invented the wireless tech (it's the basis of all wireless standards like wifi, wimax, and LTE) in 1997 and first put its wireless products into the market. However, very soon many big companies start to use wilan's inventions to develop thier own products without wilan's permission. Wilan tried to talk with the companies about licensing its inventions. The big companies refued to talk but said " sue us then we can talk" (it's a threat as i understand).
Litigation with big companies may be a suicidal mission for any small company like wilan with litter resource. The unfair competitions made wilan impossible to continue its production line. In order to survive, wilan took a bank loan for 20% interest, to initiate a lawsuit that almost put itself into the bankruptcy. The unfair competition and unable to enforce its ipr due to its lack of resource, wilan eventually gave up its product line as well as its dream to be a new Qualcom. Who is to blame for?
Now it's apple that blocks wilan's patent rights and innovation. It steals wilan's inventions for gaining the huge fortune, but refuses to pay. That's the real problem for innovation, in my view.
good luck