El Mahdi
Muad'Dib of the Anauroch
As for your last point:
Let's break it down:

then consistency (rules varients generated by inexperienced designers and/or overworked developers start to spawn and cohesion in rulings breaks down leading to ad hoc interpretations as the de facto way to play)
...Giving up the unified system with Essentials and Arcana Unearthed? Done
Let's break it down:
- Are Essentials "rules variants generated by inexperieced designers"? - Nope! Essentials was designed by some of WotC's most experienced and tenured designers. Just so I can't be accused of conjecture here's the main designers of Essentials: Mike Mearls - Lead Developer of 4E (if anyone understands the ins and outs of the 4E rules, this is the man); James Wyatt - writing for D&D for 14 years, working for WotC for 10 years, and author of the 4E DMG; Bill Slavicsek - designing RPG's for 19 years, and was originally hired when D&D was still published by a little company called TSR! - Inexperienced? - I don't think so! (just check out his resume at WotC or on Wikepedia)
- "...cohesion in rulings breaks down leading to ad hod interpretations as the defacto way to play." - I think the jury is FAR from making a decision on this one. But so far, it looks like the essentials are quite consistent. And where it appears there may have been conflict with existing rules, the rules were changed and apply retroactively to previous material. Also, with all changes updated to DDI, the consistent, unified system hasn't gone anywhere. They have also been very pointed in saying that Unearthed Arcana material will not be included in the Compendium and will be completely optional in home games, and have provided plenty of caveats and warnings that such material may be unblalancing or at best, experimental.
