DTM is GT3, British GT is GT3 mostly, World challenge GT is GT3, hence Scaley, ,Carrera, NSR, Slot it, SCX and Sideways want some of the action, which is understandable.
The very bottom line of any slot manufacturer has to be livery possibilities from the expensive mould, having this many championships to go at is a very strong draw for them.
SRC going TS50 and 919 is a brave move given the limited liveries available I think.
If you put like that then carrera and scalex do plenty of "odd" and "old" cars. Not to mention some brave moves as well that go no where.
But looking closely, and I know that I keep saying this, most of these models are more than a couple of years old.
To be honest, and this is my personal view, the only manufacturer that is really pushing on the GT3 in 1/32 is Sideways, followed by Scaleauto, Slot.it and NSR.
Just to be clear, I am talking about releasing current (as current as they can be) models.
About SRC, I really do not understand these "brave" moves: why do you invest so much on models that would at best give you a couple of livery?
Why not starting with the DPi cars: these look really nice, there are at least 3 different makers (cadillac, mazda, acura), and if the dimensions are right can be raced in LMP classes mixed with GT3 cars. Once you make enough money from these, then you can dare more and do more ambitious projects.
My impression is that most manufacturers have no clue of what current racing is going on...
Now, if we are looking at something modern and interesting, (W)TCR would be a nice class to look at.
If Slot.it made them I would buy 3 of every livery/model they make.