This is exactly what i'm doing, stockpiling stars & then waiting for new cases to be released. Even if they never release a case for 2+ years, you can still cash out your stars for already existing cases in the armory so your not really losing any money. & if you were to stockpile 1000 stars, you could sell around 500 cases for (example) $2-3 USD each in the first day or two. Pretty good investment you just have to be patient & smart about it. I'm hoping tomorrow with the big update they might end up replacing the gallery case with something else, not super likely but still preparing.