"Future of the NEX system"?
Big question. Ultimately, as it grows I can see myself switching to a NEX set up eventually, but still having an a-mount set up alongside, just a smaller one. This assuming the lenses, bodies and electronic viewfinders will come, but I'm confident they will. I think for weddings having a lighter set up would be a big plus, as well as something that is physically more discrete in terms of size and noise, I can see it being a big plus.
For me that would be a 3-4 years down the line consideration though, so a lot can change in that time.