It's like eating broccoli. You need to do it. It's good for you. Some of us even like broccoli on occasion. But writing something every day? What if I don't have anything to say? What if I'm too busy? What if it's raining so hard outside that I can't think past is my basement flooded yet?
Yes, I contend that writers must write everyday, that we always have something to say, that if we're too busy to write then we need to look at our priorities, and that when distractions occur we need to have a plan ahead of time.
Is that to say that people who don't write every day aren't writers? Of course not. It's where your focus is. If you have kids, have an intense/stressful job, family drama, water in your basement, etc., that's probably where your focus is. No sin in that. But for those of us who can and are willing to give up daily TV watching, social events, and do laundry in all-day marathons, etc., we can put our focus into writing. There are those amazing individuals who can do the career/family and writing all at once (amazing, stressed-out, crazy people), but I'm not one of them.
And who's to say you can't change your focus? Once the kids are gone, once the basement is dry again, go back to writing. It'll be there waiting, just like the trusty dog that loves you no matter what.