Call me naive, but I'm suprisingly optimistic about them fixing the problems with the car system.
Pretty much everything they have done so far caters to long time fans of the series:
-Donkey Kong and Toadette where the most mourned after cut characters and they brought BOTH back at once!
-Bowser Party not only practicly brings back the Bowser minigames from 4-7, but it also let's you take control of the Koopa King yourself this time around!
-Amiibo Party harkens back to the classic days of the series stars,coins,items and everything!
It could just me beeing too optimistic (because I really,really,REALLY want this to be great) but I wouldn't be shocked if they heard the complaints that arose from Mario Party 9 and are trying to fix them, while still maintaining the new style, three years between 9-10 should have given them enough time to do so.