Adventure mode turns to story mode

I have come up with a brilliant idea. Seeing adventure mode as the most useless mode in Minecraft ,we can and some tweaks to it to make a better gameplay experience. This is what I call story mode. In this mode you have a story to follow. Example: you were a hero summoned by the villagers to free the world from darkness. Your main objective is to slay the ender dragons. This mode will be similar to adventure mode . What I mean is that you can't break block or add block. What you will be able to do is completely a mission to get ores. (Harder the mission the more you get rare ores). In this world of adventure you are introduce to generated structures everywhere for you to explore and collect loots similar to Minecraft dongeon. Your levels will increase so do the difficult of the game. You earn ores to buy food, armory ,tools ect. What do you guys this should be done to make adventure mode better?