I've always wondered what would happen if Nintendo decided to cross their Mario franchises. It started out small, with Mario Party 5. Remember who the hosts of each mode were? That's right, the Star Spirits from the first PM game. Now, we are getting Super Paper Mario, which is just SMB with paper characters, see.
So, if the trend continues, we should see..
Paper Donkey Kong (paper version of arcade DK)
Paper Mario World
Paper Mario Land
Paper Mario 64
Paper Mario Sunshine
Paper Luigi's Mansion
Paper Mario's Picross
Paper DR Mario
Paper Mario Kart
Paper Mario Party
Paper Mario Tennis
Paper Mario Golf
Paper DDR with Mario
Paper Mario Baseball
Paper Mario Soccer
Paper Mario Basketball
Paper Mario RPG (paper version of the original Mario RPG)
Paper Mario and Luigi: Superstar Saga
.. and if they wanted to go to extremes..
Paper Mario is Missing
Paper Mario's Time Machine
.. and no, this is not a joke topic. I made the same topic at GameFAQs (on the Super Paper Mario board, I think), and they thought it was a joke.