There wasn't enough turnaround time to use warlock results to shape monk. The packet was being finalized while the UA 5 results were coming in. I agree they intended the monk to be in packet 5, but I don't know what held it up. Maybe they couldn't get the class to work the way they wanted and just opted for the superficial changes over 2014. Maybe they had already decided to switch gears while packet 5 was being worked on, but it wasn't feasible to change the mages and warriors, so they released it knowing many of those changes were already being walked back (like Subclass levels or epic boons). We won't know.
That being said, I share your conclusion that unless the spellcasting warlock really Sparked Joy on those surverys, its toast. Which is a damn shame as it was an acceptable fix for the big problems with warlock casting. But at this stage, I'm jaded enough to think that paladin Smite Spells and Rogue Cunning Action also have very slim chances of making it.