My point is: that is as likely as them closing the studio in fear of a metheorite hitting the buildilng and being forced to pay metheorite insurance to the families.
I do not subscribe to that point of view, but again - arguing over it given how little we know wouldn't be very productive.
We actually know a bit.
We know it had nothing to do with profits, for one. CoH was bringing in more money than GW1 (shocking given CoH was mainly a US-only game).
We only think it's not about money. Paragon Studios were making modest profit with CoH, that much we know. But they were also, as you pointed out, working on other titles (two, if I recall correctly). That costs money. NCsoft was also realignining their western operations. Again, that costs money. In the long run, the profits could have been too little to justify supporting existence of Paragon Studios in the eyes NCsoft's management.
As for GW1, it wasn't bringing that much money, but it did bring tons of it in the past. And there was a fresh sequel in the wild that NCsoft was heavily betting on. CoH on the other hand was never a goose laying golden eggs. We also know for sure that its younger sibling wasn't CoH2, but an entirely new product with no recognizable IP franchise attached to it. GW2 easily trumps that.
We also know it had nothing to do with Cryptic and legal action from that side.
How do we know that? This is a genuine question. I'm not trying to be snarky.
We also know until the last day they were still had job postings that got approved by NCSoft.
Unfortunately this only means that NCsoft was okay with deceiving the staff of Paragon Studios. Not something to be proud of, but perfectly legal.
We know they were working on an additional title and also that they keep other studios running in pure development mode (so CoH could have been canceled without closing Paragon Studios.)
Unless they decided the title PS was working on didn't have a bright future. Just like they did it with Auto Assault, Tabula Rasa and others. This time, though, they decided to pull the plug before the release, not after. That's new, but entirely possible.
We know enough to at least discard lawsuits, is my point. Also to discard any economic woes. That does not leave much in the table (as far as valid reasons go.)
I'm afraid we know nothing of the sort. As stated previously, there's plenty of assumptions up there in your posts and most of them are very hard to verify.