Notice - this is not really a straightforward question.

The longer they take, the greater our collective expectations will be for the following factors:

1. Length of the DLC/Expansion, in terms of numbers of quests and their depth.
2. Quality of the release.
3. Availability on all computing platforms.
4. Feature add-ons, such as armor, weapons, artifacts, alchemical items, skills, perks, combat/stealth/magic capabilities and so forth.

Anyone have a comprehensive opinion/recommendation to offer the guys and gals at Bethesda regarding a new DLC/Expansion?

Again, it's not an easy question to answer in total, so take your time and feel free to expound at length if you deem it necessary.

As long as they want.

Hoping for 3 simultaneous releases. Enough of this exclusivity crap.

Whatever it takes to make something new and exciting.