There are studies devoted into talking about “millennials attention span”, if you would like to know more, google scholar has quite a number of these journals.
Anyway what you described is peer pressure. If your peers like to do X, chances of you getting into X is high just to “fit into their circle”. Teens today are faced with many more options than teens in the 80s-90s, which is why games which are marketed more get more traction than other games which invest lesser in marketing. More exposure = more people learning about it = more likely players = more influences from peers.
In the 80s-90s, the only marketing channels we have are from radio, paper publications and TV. Reach is limited and therefore there are lesser options for us. Now… with social channels in the WWW, video streaming mediums such as twitch, youtube, many more games are exposed to the people and therefore more variety for players to choose from.

. I don’t see why people like to talk about sex so much.