Sony has probably the most radical market segmentation of any camera brand - they are really focused on avoiding overlaps as a way to force buying into multiple categories (under the guise of "we build the best tool for 1 job" ) - Canon does it too but their "cripple hammer" approach is less elegant (purely from a marketing standpoint, not a judgement on the success of their approach)
That works when the steps are not too stretched - with the A1 they were pushing that limit but the camera was so novel, they could get away with it. Market has changed in 4 years, and if they push the price to $8000 (with grip) they will certainly test the resilience of their strategy, especially when they are not really looking after those who already paid to get into the Sony system.
What portion of A1 owners will skip this upgrade? What portion will leave because they don't see a focus to serve their needs? What portion will put up with it because Sony still offers the best option for their needs but will resent the brand (never a great strategy)? What portion will be pleased? And let's go crazy, what portion will buy into Sony because the A1mkii will be so goundbreaking that $8k and a kidney will seem like the bargain of the century just like the original did?