I agree.
The Bauhaus School of Design that Leica employs gives the Q a look that is unmatched by other cameras of this form-factor. It will be quite the hit considering how good the images are. Moving to a Q-mount version seems like a natural progression and allows them the opportunity to sell to more "seasoned" photographers as a primary camera instead of a backup/walkabout camera. Mirrorless means they can have zooms again (as evidenced by the T).
It will be hard pressed to beat the Sony A7rII which is hitting all of the key points that pros want (OK, neither of them have dual slots. Don't go there.)
This might be desirable from some users' standpoint (including you and me), but Leica has to give some thought to brand strategy.
T mount was just released, presumably to fill the purpose you outline for a Q mount.
Another Leica mount would confuse the market, and possibly cannibalize the M market, which I would guess is a no-no for any Leica decision maker.
So my guess is this won't happen until the M market is perceived to be threatened. Currently that's not really the case.