"They feel no need to be loyal to a scene. Right?"
I think the idea of a "scene", as we understood it as kids (your local Department of Punk Rockers) is probably dead. There used to be a well defined course of action a kid could take to start a punk band when I was young, and a group of insider local older folks that you needed to ass kiss to in order to get gigs. Club promoters, local record store owners, local record labels, etc.
I think "scenes" now are just cliques, and a lot of it happens online. So like, you might have a really well defined group of Skype friends that you do group chats with, and people are loyal to that. And some people rise, and some people fall. And there is dating and drama, etc. Some of these people might not even live in the same state.
I grew up in a small town with a small punk scene; I dunno if it was all that great. Whatever local yocal Misfit t-shirt wearer was going to be your new best friend until the end of high school (or until you moved). You didn't really have much say in who you were going to hang out with. Whoever was in the scene is who you walked around town with all day.
I think more so nowdays people are rejecting whoever they live near in hopes of finding cooler people via the internet. Folks might not even live in the same state, let alone the same country.