Expansion pack ideas

I think they should add an expansion pack where it is Back In Time. Maybe they could add worlds like pirates, cowboys/western and medieval and maybe like a retro one. They could add tons of new gears and loads of new events and when you start the game, you start at the beginning of time with like cavemen and as you collect more points for playing events you go forward in time. Then when you finish there is a big boss battle (no clue what the boss should be, let me know in the comments). After you win, all of the worlds should come together to form one map. Then you can complete the rest of the events and quests, then have fun and cause chaos. What do you think?