I had to sigh and exhale loudly before answering.
No, it's not the end of Midgard, and thanks for your interest.
However, a different glitch—no doubt caused by turning Minecraft on and off repeatedly while I was trying to figure out what was going on with this damn horse—really put me in a sour mood.
I'm currently playing two hardcore worlds at the same time. I'm sure I'll return to Midgard someday, but my presence on these forums is rapidly fading, as is this year's interest in the game for me. I haven't played in eight days and don't plan to play soon. I may go into Minecraft hibernation for six months, just as I have every year, which is why Midgard is 5,000 Minecraft days old and not 10,000 (like Mr N Derman's, above).