+1
I guess you are 100% spot on... The SL looks to have been released as to miximize the S-006 / 007 sales and also the integration of S-user lenses with the Sinar cameras (with the SL used as an MFDB) for those who want to add a view camera ability in their system (since the interface required is the same as the SL to S lens adapter)... If Leica was after "just a mirrorless" they could have released a - cheaper to - Leica Q version without the lens....
By the way, the rumor some try to spread that the S-lenses leaf shutter won't work with the adapter,
is pure fiction that they made up... I had to call Leica and ask them about that, their comment was "pure fiction... none is authorized to comment on an unreleased product yet, as he can't possibly know what the project manager will come up with, we won't restrict capabilities out of any of our products if we can apply them"....
You are right on the S-adapter delay, but I think that it has to do with the Sinar interface being developed in parallel to it... So I guess there should a small size (like Actus or Universallis) view camera coming soon from Sinar, with the SL in mind instead of an MFDB...
The S-007 demand is "off the roof" at the moment from wedding pros that want to use their existing line of C645 lenses on it so the demand can't be damaged from the S-adapter absence and I suspect that SL will have a good start by the owners of R&M lenses as to keep it in demand until the release of the S-adapter... but again, it would be best for Sinar to have a finished product as to accurately adapt a view camera to it... isn't it?