I disagree. I see no inclination from the diecast crowd (AutoArt, Minichamps etc) to listen to their customers in the same way Otto or GT Spirit do. If it wasn't for Otto, I would still be waiting for Alpina 1/18s to this day.I never understood the statement "resin companies do the models that would never have been done in diecast". Well that is just not really a statement that can be supported by any facts. If the resin companies had not popped up by the dozens, and had diecast remained the standard in model making as it was, I am sure many of the models, which to now have only been offered in resin, would have been done in diecast. Had collectors not been so welcoming of resin in the first place, we would probably have gotten most of those previously mentioned "resin only" models in diecast, by default.
Otto in particular make rather 'out there' and unexpected models which fill gaps no other manufacturers seem to be capable of (or have no desire to fill). I suspect it's down to tooling and cost of manufacturing. Minichamps in particular however has a penchant for re-releases of old moulds in with new liveries with no improvement in detail and higher prices.