Minecrafts future solution

The problem with Minecraft now a days with every update the player's challenges never change.
for players that already have the best armor or really good armor, nothing is interesting anymore.
What is aslo a problem is that mojang cannot implement new armors or weapons because the player would be far too strong for anything to happen to him.

so i suggest what i personally think mojang REALLY should implement.

After you defeat the Ender dragon or if you find a special structure in the end and interact with it, your Minecraft world "not dificulty" should change into [Hard Mode] "perhaps some of you recognize this from Terraria"
-new mobs
-harder mobs and more gear on them
-new structures start to spawn

exct

i see this as the only way minecraft can progress into the future.