For a reminder:
Brussels Airlines is an integral part of the Lufthansa group, which isn't exactly a weak company financially, to say the least.
Lufthansa knows too this virus and the over-the-top reaction to it by the flying public (spurred by all too much media attention?) is not something which will change the long term outlook for aviation, nor for Brussels Airlines in particular.
At their other branches, they will most likely be noticing exactly the same impact from this virus, so the focus for them now will be to limit the losses by reducing frequencies and grounding planes and basically ride it out as best as they can. (maybe hoping others will have a much shorter financial horizon and meanwhile pull out of some routes entirely even).
Exceptionals don't change a long term strategy of a successful multinational towards a specific local entity, especially not if the exceptionals are pretty much globally and temporarily.
What it does underscore once more is the importance of them being well embedded into such a multinational: as a stand alone, I fully agree they'd be blown away quite quickly by events like these, pretty much like Flybe is.
Once again, they can count themselves very lucky to be able to shield under the very strong financial umbrella of Lufthansa when it rains: let that be a lesson for all those who are quick to say they should be going it alone as soon as the sun shines a couple of weeks.