I don't buy it. The service just launched in NA five months ago and in western Europe (minus France) last week. France is now to come in the second week in April, India when the cricket starts (?), eastern Europe after that, and who knows when China happens? The global reach is microscopic compared to the theatrical distribution chain, so the revenue channels (and price points} are significantly less. I'd speculate that streamers across the board are close to a decade away from even considering this in any serious way, although shorter theatrical windows are likely to come much sooner. Now the virus may have sped up the process of this new reality behind the scenes, but not nearly this fast.
If we are in this same place 6 months from now, then studios may be of the mindset that any revenue is better then none at all and be willing to accept the losses. Where I'd wager they try to make that up is with guaranteed subscriptions, ie, in order to stream BW on Disney + you need to sign up for a 5 year subscription package. That may even be part of a tiered system, where what you pay for the film determines how many years you're locked into a subscription package. So $20 dollars for BW requires a (new) five year package. Paying $40 dollars gets you locked in for two years, etc. Existing subscribers just pay $20 for the film with no further commitment (rewarded for being early subscribers), and/or get to extend their current plan at a discount with purchase. I'm obviously just spitballing here, but in order to make the move to streaming worthwhile at this point, the loss of revenue globally will need to come with future benefits, including a boost in stock price with such commitments and guaranteed revenue.