Travelling has become so easy and common that a lot of people are travelling now who wouldn't have travelled some decades ago. My Chinese teacher (who is from China but now lives in Germany) is always making fun of the Asian tourists who are travelling to Europe primarily as a status symbol to be able to post photos on social media, I think you do have a point with your selfie stick argument...
Maybe the internet is part of the problem as well. Some people are planning everything in advance and have seen dozens of photos and reviews of their accommodation and the places they plan to visit before they get there, so of course, they have certain expectations and are not open-minded at all.
I had an amazing time when travelling without any wifi-device for months and think that travelling is all about the experience and not planning ahead. After all, I think that not the travellers have changed, but there are more people travelling now who don't have a traveller's mindset.