To some extent.
Though for the Contax and V bodies, I suspect we'll see near-parity levels of support for many mamy years to come. The reason being the interface (mechanically and electronically) is so incredibly simple and there are no politics. It's like supporting the TIFF format; any 8th grade computer science student can implement support for TIFF (it's that simple) and you don't have to license anything from anyone or worry that the specifications of TIFF will suddenly change.
I suspect we'll also continue to see support for the H platform for a good long while. Phase/Leaf continued their commitment to the H platform even after Hasselblad closed the platform. Hasselblad sort-of returning to the open-platform table with the H4X only improves the odds it will be broadly supported for a good while.
But yes, if I were to bet on a platform, I would bet on the combined platform power of Phase One, Mamiya, Leaf, Schneider, Capture One, and Media Pro along with their industry partners like Profoto (see also: V-Grip Air and USB stick). Especially when you talk about "development" meaning new capabilities, features, and advancements. For instance the ability to sync flash wirelessly at 1/1600th with standard studio strobes; that's not something I would have expected e.g. Pentax, to implement.
Of course - I'm pretty biased :-).