One of the things that is unique to Christianity is that we are promised not only resurrection from the dead, but a brand new world. The Bible calls it the New Heavens and the New Earth. We get a small picture of this as we look at these verses in Hebrews. We discover that Mount Sinai was a reality for the people of Israel, but it was a pointer forward to the time and place where God Himself would be approachable and available to us all. Jesus made that possible.