Ohhhhh... no no no no. I for one, would not participate at such a table. That's the beauty of poker - it's not always about playing your hand, it's about playing the player, your position, etc. Showing all cards at the end would be giving my opponents much too much information.
This could be a fun concept though for beginners. Kind of like when you are teaching friends/family a new card game, and you have a few practice rounds first to help them understand how it works. I
have done this for home
poker games, when people have no idea how to play.