Of course... !
Seriously though, I - and I'm sure almost everyone else - have absolutely loads of models which I've bought and painted up but never, ever use. Boredom, lack of effectiveness, change in the local meta, or being superceeded by new better options at their points level are all reasons why stuff doesn't get used. And sometimes my painting is a bit crap and I'm embarassed to put the stuff on table too 🙂
In M3E I am 100% sure that I will still have loads of models that I will never, or hadly ever use. All that will change is which ones I no longer use, and the "why" of why they won't get used.
Boredom and lack of effectiveness are things that a new version 'should' address. The meta will also inevitably change, and the shift in game balance towards more tightly themed crews appears to have been specifically chosen to address the 'better options at their points level' issue too.
M3E does admittedly bring in a new reason as well - "faction changes mean I need to buy more stuff if I want to keep using this model" - but on balance I think I can live with that if it helps keep Wyrd in business and keeps Malifaix alive as a system. Otherwise all of my models will end up unused.