I would assume the launch of the Switch successor is why they are clamping down. It's likely very similar architecturally to the Switch. Nobody knows how long it would take to hack it, someone could be silently sitting on an exploit that they've been saving to see if it'll work on the successor. In the event it's hacked quickly and there are still actively developed Switch emulators, it wouldn't be a stretch to believe support would quickly be added to those emulators for the successor.