Rathalos
Play Monster Hunter!
I'm sorry but I thnk this is a terrible idea for MK10. The thing that makes MK zoning unique from SF is that every character has a different type of projectile with different properties. How would projectiles like Shang Tsungs ground skull or Sektors up missile trade? Would Strykers gunshots destroy the other projectiles and then still hit the opponent with the second shot? Reptiles force balls and Sub Zeros ice ball would become nearly useless outside of combos. The best part about zoning in MK is the diversity and there is no way to have fireball diversity but still have trading.
Stuff that comes from the ground or sky would obviously not trade, except in maybe super weird circumstances like mirror matches.
Strykers projectile obvious wouldn't trade its super fast.
Other projectiles would all have varying degrees of durability, like in Marvel and SF.
Basic projectiles would obviously only have 1 hit of durability, 2 with the EX versions. Certain projectiles like Forceballs would have 2 hits, so it eat other projectiles.
As for Sub, most projectiles would be either high or low, sub's could be in the middle so it doesn't naturally trade with other fireballs, except for forceballs that have huge hitboxes.
Even the you would still have lots of weird projectiles that can't trade ever, like Smoke bombs, or Kenshi's bullshit. So even with fireball trading, you would never truly get ride of NRS loony toons branded zoning.
I have no idea if it would make the game better or worse, but they should at least test it internally.