Weird how people are now saying that Kalafina could exist without Kajiura. You do know that there is only one golden goose between all of the people involved, right? 3 girls, lots of people behind the scenes, staff, front band…but when all is said and done, it comes from the mind of Yuki-sama. Without YK producing songs there is likely nothing but crap to follow and that is why more fake rumors are swirling around YK about Kalafina 'reforming'. Kalafina is not like an average pop group unit where you can switch members and composers on the go. It's a project stemming from the historical work product of YK, nothing more or less.
Also, Its not out the realm of possibility for a new unit to be established, managd by FJM. However, for CD releases they would probably need a publisher and some restrictions would come with that. Having Sony publish Kalafina meant things were overall much easier to promote than say, Flying Dog. This is simply because Sony/now Sacra are not simply a music publisher, but also a quasi-governmental entity with supranormal powers to promote their crap literally everywhere even inside of your toilet, and also the best network of staff from graphics to mixing and studios that you can find anywhere. Also for group to hit those sorts of numbers you need girls who are under 30 and as we know, that would necessitate 'new staff' for singing so to speak.