THEY MUST NOT MAKE IT!

Significant content for TF5 was promised, and never delivered
Valve put little faith in TF5 since they almost certainly started working on TF6 right after release
The fact that TF6 is nearly identical to TF5 will decimate the community for both games
The announced date is not nearly enough time to polish content or make significant gameplay changes
The new character designs seem bland and unappealing so far
TF6 is too colourful to fit in with TF5's visual aesthetic
The fiddle-based horde music is extremely disliked, though the differently orchestrated music is otherwise welcome
TF6's release will result in a drop in quality and frequency for TF5 content, even compared to before
The community has lost faith in Valve's former reputation for commitment to their games post-release