Yeah there´s probably a handful of people who´d be interested in it and that interest doesn´t necessarily end up in actually releasing a game. I just tried exporting with it out of curiosity and got an error, who knows how long it´s been there and nobody ever noticed. Also I don´t really care :V
I think the main console I´d ever be interested in is the Switch simply because it seems like a perfect fit for 2D games, but considering Nintendo used to support HTML5 for the WiiU and then dropped the support for the Switch, it´s very unlikely to happen. Same for Microsoft as you mentioned, once it´s gone it´s probably not coming back.
Otherwise I´m fine with the export options especially since you don´t charge extra for them. (And yet you have people whine about how expensive C3 is)
EDIT: ratalaika I´ve always wondered what a port costs at minimum. Like, I´m interested but I wonder if it´s worth it in terms of ROI.