Until my kids were grown, touring for more than a day or two was a time luxury that was near impossible, especially when their mother didn't share the same level interest in cycle touring.. I think that there's plenty of touring happening though touring has always been a smaller segment of the overall cycling world. As mentioned by others, there are plenty of sources for touring bikes / gear and bikepacking, which is a type of bike touring, gets lots of exposure. Popular multi-day routes in the United States, like the Great Allegheny Passage and the Katy Trail, have lots of tourers. With regard to e-bikes, I suspect that will bring some folks into the touring fold once they are confident they can charge their bikes along their chosen routes. I encountered my first e-bike touring cyclist along the Oregon Coast in 2016. I can only imagine that there are many more tourists on e-bikes on that route now.