I don't think the successor to the Y-9, i.e. Y-30 has been cancelled, although there have been no updates on the project itself for quite some time. Recall that the Y-9 had just been introduced into PLAAF service in 2012, barely more than a decade ago. For comparison, the newest C-130 family, the C-130J Super Hercules entered service with the USAF in 1999.Great asset, maybe thats why development of Y-9 successor has been slowed down, or eventually get cancelled.
That means the Y-9 is still relatively new compared to her American counterpart. There simply isn't enough of an urgency to justify a replacement for the Y-9 for the time being, hence the development project for the Y-30 has most likely been slowed down.
Agree on this one, but it also depends on the present situation on the battlefield. Though, I am seeing transport drones as more useful for paradropping supplies, weapon and equipment on or behind enemy lines in airspaces that are deemed too dangerous for manned airlifters to fly through.Future of tactical transport goes to drones first... Then medium and heavy transport will follow in further future...