I guess you have to analyse, what it is that's actually demotivating you, is it purely a lack of interest in photography or the equipment your lugging? I guess you have to address this before you can find the solution.
I'm one of those idiots that lug half the world with me just in case (i still haven't learnt any better) But i look at is as a way to keep fit carrying 60lb of camera gear on my back!
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
But seriously, I have gone through periods where i cant get motivated, for many reasons, like lack of available time, despondent with results, appalling weather, and as a landscape tog it can be a bit frustrating at times being at the mercy of the weather etc.
I have in the past, rapped my hand in and sold all my gear, both times i have done this i have regretted it. So jump ship into another format or manufacturer by all means but don't sell up. (it looks like in the future all DSLRs are going to be getting smaller like the Sony A7R etc).
If you want motivation for getting out and shooting .... whatever the subject and you feel you need a bit of a challenge go to "Ideas and Inspiration" on this site and take up TP52 and shoot one subject per week (not as easy as it first appears). but you might find the challenge inspires you (you can jump in at any time even though its half way through the year).
I have had a bit of melt down recently with a loss of Mojo mainly due to being to busy to get out and about.... I hope you get your Mojo back Ian
Good Luck Mate