One-atom-thin ‘silicene’ silicon transistors invented
kurzweilai.net
kurzweilai.net
Now I guess it's not only accepted but there are already devices? That's some rapid progress.
We knew it would likely be possible to grow, but how easily and what final properties it would have (due to interactions with the surface it is grown on) weren't entirely known. Also keep in mind this is one of a dozen different possible technologies for building future devices with.