I wouldn't call it petty or conspiratorial at all. In fact this is a very standard reaction you get EVERY TIME you bring in a new engineering lead to maintain an existing software project. The first thing they almost invariably do is suggest throwing out the whole product and starting over because clearly they can do so much better and what exists must be a giant deeply flawed mess, etc. It is an "NIH" effect. It is QUITE obvious that's what is going on here with Mike and 4e. It is a rather insidious disease too, despite how easy it is to predict. There are ALWAYS some arguments for making a clean break and doing a new product from a blank slate. In this case it looks like Mike is pretty much in charge of making this decision. It is a slam dunk, and USUALLY a bad move at that.
As much as it seems to be the popular belief, working in software/IT and the peculiarities of that culture, are not the end-all be-all of work life and workplace politics. I do not consider it at all obvious that that is what's going on. There's plenty of evidence to indicate perfectly likely monetary and business motivations for WotC.
Well, clearly the trend has been accelerating over the years, and 4e is still at the short end of the spectrum no matter how you count. The problem is that every new edition is another fracture in the fan base. Eventually you have nothing left but the worst-case scenario, just the people that will 'buy anything that says D&D' reflex buying this year's endless rehash of core rules.
Maybe. I personally suspect that this is a "farewell" edition of D&D that will be shelved after a relatively small run of titles. Leaving the IP to be resurrected after 10-15 years. I'm guessing that WotC has concluded that the audience's appetite for new editions is insufficient to maintain D&D as a constant, ongoing concern. Of course, if Next succeeds in its goals of unifying the audience, then WotC have the option to continue cranking out as much product as is profitable. I think the "unification" goals are an attempt to ensure that there
still is an audience about 12 years from now for which to write 6e. In this, I will be happy to be wrong.
I think we can make perfectly good comparisons of 2e and DDN. DDN may not be complete but even Mike tweeted something about once a couple tweaks he was working on were finished the "core would be complete". I think its valid to draw some types of conclusions. CERTAINLY we can consider the faults in a system that tacks on many disparate subsystems and has no strong exception-based design. THAT was the essence of the problem with 2e, mechanically. You had a dozen different confusing and competing ways to try to implement something and the result was chaos by the end of the Player Option series. It was indeed a hot mess. If you can have all the benefits without the downsides why wouldn't you?
Maybe you can't have all the benefits?
Seriously.
A lot of us, myself included, have been enamored of unified mechanics. Maybe they aren't the best. Perhaps there's a middle ground between 2e's hot mess and 4e's strict conformity (hopefully one with less fiddly bits than 3e, AFAIC.) Certainly a great many people who were turned off by 4e cited that as a reason (and something similar can be said for 2e).
At this point, I'm willing to accept that my desire for an "elegant" unified system is not the best architecture for D&D. It seems to work well for some of the other systems I like, particularly more Narrative-oriented ones. However, it doesn't seem to create that mystical magical feeling of "D&D." Why? I have no idea.
I'm certainly not suggesting that we go back to AD&D, where there were several different ways to "hide" depending on how, who, where, and when they were doing it. However, I don't think its totally unreasonable or unworkable to suggest and test a system where martial maneuvers work differently than spells.
Yes, and note the guy that is one of the cheif architects of that business model as well. A guy who seems to keep pulling off successful game system launches too. I think I'd be all over that if I was running a game company with any pretensions to be a good business. WotC is according to him wasting its time churning out new editions, it is a loosing game. At least that is what I gather from what I read.

I'm not sure who or what you're referring to here. You're grammar isn't parsing for me, but maybe its because I don't have the antecedents you think I do.