I spend a good 80% of my time in the midst of one existential crisis or another (damn you, overactive brain!). It happens. There's no harm in taking a break or simply moving on to something else; Cartier-Bresson gave up photography and returned to painting later in life.
For me, it's usually attributable to boredom. Traditionally, my cure for this has been travel, though it's never possible to travel as much as I would like. More recently, I've been trying to work on the "vision thing," focusing on producing a set of photos on a very specific theme to the end of creating a set that could theoretically be shown or made into a book (not that either of these things will happen). After feeling like I had exhausted many of the photographic opportunities in my area, I'm now seeing things in the context of these themes, which has made the process interesting again, for now anyway.
Another area that's opened up is printing (digitally for me, though traditional printing would be even more of a challenge). I'm still not terribly good at it, but learning a new skill set and applying it to photography has been useful in maintaining motivation. Envisioning the photo as a print is wildly different than on a screen, as of course is actually seeing it that way.
If it were me, and it probably will be (again) in the not-too-distant future, I'd put the cameras down for a bit, look back at your previous work, look at other people's work, look at the world around you without a camera, and see if something sparks your interest. If not, have a pint and think about it some more. It's a well-known fact that beer is the preferred treatment for existential crises.
