Yes, I've been figuring ratios based only on one year's revenue, so in fact, you're point on that is correct.
However, while I think it's too general to expect 2.5% based on annual revenues, since there are other items involved that aren't necessarily infringing products, but that contribute to the generated revenue, generally I agree with you that to this point, licensees have gotten off easy with no ongoing royalties, and with a likely forgiveness of prior years infringement to a large degree.