It's like a car, they can't give you all the upgrades every year or they'll have nothing for next year. This year was a 1080 screen, next year will be a bigger 1080, then a flexible screen, then a higher res flexible, you get the point.
Me, I was originally very excited about the 6.3 rumors, then excitement dampened when rumors said 5.99 then pretty disappointed when it was 5.7. Will still get it anyways.
Same for me I almost spent $750 to import a z ultra but decided against it due to the non removable battery, no flash on the camera, & lack of cases available
6 is probably too big for a phone to be successful. That's why Sony offers the bluetooth handset with their z ultra so you're not holding this massive thing while trying to talk.