The FOV of the IMX264 matched with 200mm F/4 scope would be quite limited really (37' x 30') and sampling at circa .89" per pixel will require longer exposures to capture faint signal, and that's where 12 bit ADU and small pixels will have an impact on the data, in spite of low read noise.
While the result with 1s exposures is quite impressive, nonetheless I do not think that a sensor with these parameters will lure many manufacturers to implement it in an astro camera, with the exception of budget ones. That's how I see it anyway
EDIT: I just checked Emil's DSO gallery - I should eat my words! LOL