I sincerely doubt this is the beginning of a total depopulation of Seattle, for Boeing is just one of many companies finding themselves in a similar situation. If you’re on the board of a for profit corporation trying to remain profitable in times like this, it’s not unreasonable for them to try and reduce fixed costs. And something like a brick and mortar office buildings require a lot of upkeep and expenses every year. If they anticipate keeping many/most of their employees as WFH down the road then why not look at offloading these kinds of facilities?