They need to produce a lot more High Level (10/15-20) adventures, and expand out the spell and loot list for early/mid levels. Progression at this point is predictable and boring as a player, and as a DM I've been needing to pull from 3rd and 4th additions to help keep things fresh and fun.
5th edition has lots of adventures that start at level one and wrap up around 10 or 12 but I've been missing that higher-tier content as well in the official books. I understand that by that level of play, most GMs want to run their own stuff so those books likely don't sell as often as Tier 1 content but I've always enjoyed reading through them for ideas and such. I too borrow a lot from 3rd and 4th and at times find myself missing tired adventures that linked together but could be run independently if needed.