That's very similar to what I used to have pre-Surface Book. But I found that the Surface Book was small and light enough to replace the 11", but powerful enough to replace the 17" (I have a Surface Dock for the "home office" part - leave stuff connected to the dock (which could include a big screen, though I haven't found the need yet - the 13.5" screen is high-resolution and very clear, so it ends up being more readable than the larger screen it replaced), but take the laptop itself travelling when need be). The tablet form is a bit clunky, but close enough that the convenience of a single device outweighs having a lighter dedicated tablet (in fairness I was on a 10" tablet, and I have a 6"+ phone that probably displaces some 8" use cases).

I don't think we'll ever see a single form factor dominate as such, but a single device that can shift between form factors simplifies things a lot, I think that's the future.