There's always the possibility that a method will be found that will allow the material to maintain at least some of these properties after "returning" to normal temp/pressures conditions.
That seems unlikely for a compound which is stable as a gas at STP. You can sometimes stabilize an allotrope of a compound which would otherwise be stable as another allotrope, but there's no real way (that I'm aware of) to stave off a phase transition, especially one as energetic as solid/gas.
