In some respects, the action by the Presbyterian Church (USA) is not surprising. It’s one of the mainline denominations that has become increasingly radicalized, politically no less than theologically, and has been losing members in large numbers for years. So it’s been on the road to irrelevance for some time now. That tends to happen to churches that subordinate their spiritual mission to a political one, and in this case to a fairly radical and progressive one.
There was a time when Protestant leaders would have their perspectives well-covered and presented by the media. Nowadays, not so much. As an editor of my acquaintance insouciantly observed to me a few years ago, "It would always be the same headline: 'Liberal Leaders Of Liberal Denomination Say Something Liberal'. That's not news."