If they are just focusing on 5th edition I think they're leaving a lot of neat options on the table.
I'd love to see these shows:
Epoch Level D&D: Showcasing old D&D settings and supplements. Then promote the purchase of POD and PDF via Dmsguild " Tonight on Epoch Level we visit the Free City, explore the mysterious towers of a crazed wizard, welcome...to GREYHAWK."
Legacy Actual Play: playing old modules and settings. Use 1st Ed, BECMI, etc.
And maybe not even show the entire session (s) but highlights or a sizzle reel per module.
Exploring some of the other fun products that that have been out there as well.
The board games, card games, and perhaps the alternate roleplay systems that they have maybe even amazing engine, or that card one they used for dragonlance, saga??
They have a lot of stuff on their vaults and and it would be silly to not dig into it.