Just in case Aba and phill don't know yet...Flatgrass and Skyworld still exist, but they're completely new worlds now. Any warp or home that was set in one of the two will bring you to the middle of nowhere. So. Just pointing it out. I'm assuming we want to funnel people toward a single new world?
Also, if any of you built a rail system or redstone circuitry on top of glowstone, you're going to have to rebuild. Glowstone is a glass type block again, so rails and redstone will pop off, and you can't place them anymore.