Here's what I've always understood (before staying clear of main legion boards and a lot of the back & forth there)...
When I joined TFE ~2007/2008, the lines were pretty clear: Movie force users = Sith Lord detachment
EU/non-canon darkside force users = TFE
...and as such,we have what there is today. The talk of new detachments being needed sounds like the same "They should belong here" mess that the SL Detachment and TFE used to fight about earlier on when I 1st joined. At one point in time, the SLD was arguing that Revan, etc should belong there because no matter origin, it had the Darth title. Sounds like a new re-hashing of that same drama....if so, ugh. I see this discussion like I see the Metal discussion.... no need for all these sub-genre (sub detachments). I mean, that sounds like they should split the IOC to an ISB-only detachment, face character officer detachment, etc.... a lot of unnecessary division. Much like the invention of "Mathcore," "Metalcore," "Melodic Death Metal" and all that mess when it's still...just Metal.
Basically...my observation over the years is that: There are several others in other detachments that have ALWAYS fought against TFE and what TFE has due to a lot of the EU bigotry that existed. No such thing as EU anymore, so that leaves: Canon (TV, film, etc) vs. Non-canon (which I will always call EU) and that line doesn't need further dissecting and really still is the same old arguments that have been floating around for almost a decade (or more).
*lurk mode back on*