I've been using a 50/50 mix of mirrorless and DSLR cameras over the past year, and I love them both. I love the small-ness of my mirrorless Canon, and I love the raw power of my enormous DSLR.
I've said that whenever my D800 gives up the ghost (which will probably be when I'm 60), I'd probably go for the Sony mirrorless cameras next. Not that this is a huge issue that I lose sleep over, but I'm pretty torn on that.
Why would I be torn when the Sony A7r II is so awesome? One issue that permeates our electronic lives right now like never before: battery life.
Why suddenly is battery life such an issue like it never has been before. It feels like the better technology gets, the worse battery life gets. iPhones haven't had improved battery life since the iPhone 5, and the hot new mirrorless cameras only get about 2 or 3 days use before they need recharging.
I just started charging my D800 battery after using it pretty heavily for almost 2 WEEKS. I never worry about battery life with that camera, but my Canon M3 was usually dead after a day and a half of vlogging. I already have iPhone "range anxiety", and currently, I'd prefer not to have "range anxiety" with my best camera either. (no battery anxiety can compare to owning a drone, however)