In my opinion, the car mechanic was not the problem of Mario Party 9, it was just how the board and events were. For instance, like the damn Captain Events, which I honestly hated. I'm fine with them using the car mechanic, just make sure the BOARD itself has more balance, like more strategy/skill and a bit less luck.
There's going to be luck regardless, it's Mario Party, but they can reduce it a bit more than MP9's level. Add items that can help you, or screw others up, like for instance, why not like a 0-1 dice block that you can give you to one of your rivals and force them to use? There's a lot they can do, and I hope they do it. MP9 wasn't a horrible game, but for me, it was frustrating with the amount of luck in the game. The Mini-Games were always good though, so I hope MP10 can have great Mini-Games as well.
But I can't help but think Nintendo looked at the let's plays of their older games and went: "Hey, let's make this game less frustrating for rookie gamers. That way, youtubers can't see people getting mad at our product."
It be funny if that was true. Especially since I've seen a lot of YouTubers (me included

) get incredibly mad at MP9, more so than I've seen for past MP games, so Nintendo would have increased the rage LOL