Minecart Design Suggestion

Hello Mojang Team, 

I hope you're doing well. The thing I'd like to get it done (My 6y/o little sister, actually) is Minecart to have wheels. 

She just started to play Minecraft this year and she noticed the minecart doesn't have any wheels. Little one thinks it would be more logical if there's component for the item to move rather than it just glides on the rails. 

She'd suggest that the wheels should be square shaped as the game catered in blocks. 

Thank you for listening to her request. We hope your team in the best of health, always.

Sincerely, 
Afwan's Big sister