This is stupid. The WHOLE POINT of a patent is that you get to control the use of your invention, for a limited time. That means you can charge a license fee to let others use your invention, you can let others use it for free, or you can just say NO and not allow anyone else to use your invention. The promise of this control is what incentivizes people to invent cool stuff and then show the world how it was done. If your idea becomes wildly popular, you stand to make buckets of money, and that's a GOOD THING for all of us.
The notion that you should lose patent protection if your idea becomes too popular completely ignores the purpose of having patents.
In order to submit your patented idea to a standards body, you have to agree to FRAND licensing as a condition for consideration. That's a good idea. Without it, we couldn't establish standards that people could actually use, and then nobody wins. Participating companies agree to do this because they WANT other companies to use their technology, for a fee. It's voluntary. Don't want competitors using your ideas, don't submit them to a standards body.
The real problem here is NOT that Apple's slide-to-unlock idea has become so popular that they should be forced to allow other companies to license the patent. The real problem here is that Apple's slide-to-unlock idea should not have been patentable in the first place. Apple was the first to implement the idea, so they got a head start in the market, and that should have been enough. Granting Apple exclusive rights to this idea does not benefit society in any way, because Apple still would have come up with the idea even if they knew everybody else could copy it. Patents are supposed to benefit society by documenting how a technology works, to make it easier for people to copy after the patent expires, and the slide-to-unlock patent does not do that: how the technology works is perfectly obvious to anyone skilled in the art, so the patent itself is useless to us. This patent benefits no one but Apple, and that's not fair.