I'd be more worried about the flywheel and starter that a few have had problems with. Seems like a 2014 cvt problem only.
I've had most failures with high mileage, only had one with around 80k kms/50k miles start making noise and was replaced under warranty. Keep up on your cvt fluid changes and replace the cartridge filter on the side of the cvt once in a while and you should be fine for many miles. Besides if it does fail you can just get a used one. There are lots around with low mileage but it might be 14' only for the cvt. I know for sure a 17' will fit a 15 though...
View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 35.5 mpg (US) ... 15.1 km/L ... 6.6 L/100 km ... 42.6 mpg (Imp)