Why would you be concerned? 4chan isn't something to make a huge deal over, its a site, with pretty and sometimes not so pretty pictures. Massively over rated and over hyped.
Now see, I was never into 4chan much to start with, but this kid was OBSESSED with the damn thing, and now, he doesn't like it anymore...
People change, their interests change, their likes change etc. I used to go on /b/ a lot, now I cannot stand it and live on /x/ though I hate that /b/ have turned /x/ into their second home .-.
Less ******s means less cancer, so by not being concerned you are helping 4chan considerably. ARE YOU BRAVE ENOUGH!?