I've got a 5D3 and its pretty handy, does just about everything I need it to do and more, if I want more rez for landscapes I stitch, more high ISO perfomance? Tripod.
For other requirements mirrorless seems to be the way. X100 for street and general, DP2M for portable high resolution. And my upgrade path now looks more and more like upgrades to these , smaller, lighter cameras. So I'm asking myself, will there be another DSLR in my future, and I have to say that currently the answer is 'unlikely'. Do I care about new models from Canikon ? Not really, they no longer seem to be at the cutting edge of this still developing technology, no, if I'm interested in anything new gear-wise its stuff that is going to be coming from Fuji, Sony and yes, even Sigma bless 'em.
OK, for sports and wildlife a crop DSLR may be a requirement.... for now anyway.