The reason it took so long for Nintendo to respond btw is likely because they've been trying to work out a deal in talks for a while now. One side didn't see eye to eye with the other and so we have a lawsuit now.
A lot of these companies infringe on patents because they know that in many cases the only form of punishment from the court system is going to be a court order forcing them to pay the fair value for what they should have paid to begin with (note "fair" is a somewhat subjective term) ...so they have no incentive to slow themselves down and they prefer to rush to market.








