1) Now if someone wants to buy a lot of coins then they need an expensive player! Coin selling won’t be impossible but it will be very, very impractical. No more pay to win.
2) As a consequence of the above, my match coins will be worth much more.
3) Now the game will be more about playing, less about trading.
4) Less out of control inflation of FIFA players as was the case with SIF Pogba etc.
So all in all, without knowing the exact details it is hard to say exactly if this is good or bad!