I have one hypothesis for part of the uptick: rear seat room for carseats. I consider myself the SUV hater of SUV haters, and I reject that you need one when you have kids (such is the idea in my part of the US), but...we bought one last year anyway, mainly to accommodate two rear-facing carseats with two adults in the front. There aren’t many cars that make this work, and you’d be surprised how big of an SUV you have to get to get any more rear seat space than a regular car. Not even most of the “mid-size” models.