Someone mentioned FF had 180 employees. Depending on location that could easily mean a yearly operating cost obligation of about US$10M.
Lets say that there are 150K active subscriptions yearly averaging $100/subscriber. That would mean bringing in US$15M before taxes or $5M after all the bills are paid. Maybe they keep $3.5M of that after taxes, especially if most of their work falls under the R&D tax category. My numbers are surely off but only clearing $3.5M/year for almost 200 employees seems doable but I wouldn't think an investor would want to sink any more $$$$ into this - especially if the app seems pretty much saturated.
I am guessing Boeing will re-brand it lightly in the next release but no major features - unless FF had a really cool new feature that sweetened the pot for Boeing. They will rather quickly shed about 25% of the workers. And unload another 25% after that as these apps already seem overly feature rich. They will then 'fork' the code keeping the GA version of the software up to date but with diminishing new features. At the same time they will be working on something 'new' which re-uses a ton of what they accomplished, it will seem like less of an app and more of a Part NNN cockpit EFB. In about 3-4yrs they will only want to support the gargantuan new EFB, price it higher and sunset the FF app. Basically, the positive cash flow from the current FF model will help offset the purchase price and help towards whatever new thing they are really planning to make.
Oh well, its fun to theorize