While DH and I get progressively better with our spending habits each year, we do still go through phases of backsliding on occasion. The last few months of 2016 was a good example, as we had definitely let ourselves go quite a bit.
At times we'll get discouraged with our quest, thinking if we've got at minimum several more years to go, we may as well get comfortable and loosen the purse strings a bit. Factoring into this issue is that as desires for expensive things, habits, and hobbies fade out of our system we sometimes feel at a loss for ways to spend our spare time, and so spending on consumables like alcohol and fancy chocolate will have a tendency to tick up. Adding to this equation is the need to take our toddler into consideration when coming up with ideas to occupy down time (since it's tougher to pull off with frugal loner hobbies like reading with any length or regularity).
But as our kid gets older, things have started to get a little easier and more parent-friendly with routines, sleep, and play.
Like most people at least when each New Years comes around we feel a bit more motivated to get back on track. At least between progress and regress, I can say that we accomplish a net gain of increased savings and frugal values each year, progressively feeling less desire to buy new stuff or get into pricey diversions.