By way of that, I think Other M gave us a pretty decent glimpse of what a 3rd person Metroid is going to feel like in the hands of most developers,
Long poorly dialoged CGI cutscenes, over emotional crying Samus, Where's Waldo pixel hunts, weapons which are already available but must first be authorized, a terrible control scheme which requires Samus to stand still while under enemy fire in order to use missiles, and so on... are you serious when you say this is how a 3rd person Metroid would be done by "most developers"?
Some of those things might have been done by some developers, but I strongly disagree that all of those would have been done by most. I don't know how much of the blame should go to Sakamoto and how much should go to Team Ninja, but it seems to me this was some rare shitty combination which thankfully doesn't happen very often, and hopefully never again with Metroid.
A 3rd person Metroid game DOES have potential, and I don't think the whole idea should be canned just because Other M was a failure. Other M failed for various reasons, but the 3rd person perspective wasn't one of them. There are no doubt developers out there that would screw it up, but my feeling is that if a developer would screw up a 3rd person Metroid they would probably screw up a 1st person one as well. A quality developer could pull off a quality Metroid, regardless of the perspective, but a second rate developer is going to give you a second rate Metroid... and apparently Team Ninja is a second rate developer.
Having Other M being in 1st person would not have made it any better. As long as all the other issues were still in effect a 1st person Other M would have been just as awful. In fact, if the game was solely in 1st person it probably would have been even worse because in my opinion some of the worst parts of the game (the pixel hunts and trying to use missiles during the boss battles and having to stand still to line it up) were in 1st person. So an Other M which was 100% first person probably would have had a lot more of that shittiness.
That's why you need to re-evaluate what you are saying when you say "Verified Great!". Maybe Retro verified a 1st person Metroid could be great, but that doesn't mean Team Ninja and Sakamoto could do the same. Look at Other M and imagine a game exactly like that but with a 1st person perspective. Is it now a great game? The perspective has absolutely nothing to do with a title's quality or lack thereof. A piece of **** by any other perspective would still smell as ****.