I think the premise is wonky kinda, since 1st gen grps would be old as fuck yet not disbanded. When i was reading abt 1st gen, i found out a member died of a virus infection -in a grp called NRG.
Also b4 i got into kpop, the western bands/artists/grps tat last decades- sometimes after 15~20 yrs i kinda lost touch/fell into less intensity with them.
Solo artists i think i cant keep up/dont hv same intensity for as long as they last. Unless they release only irregularly.
So i think if SNSD hadnt hone on semi-hiatus, inactivity: it might be tat i wouldnt hv same intensity if id started out stanning them in 2009 instead of 2018, so my answer is it depends.
If they could keep me interested as intensely from 2009 to 2021 and beyond, as an actively promoting grp; then i would still stan/bias them. Otherwise im the wrong respondent cos i stan/bias so few grps/members anyways. My biasds/ults are eclectic picks n based on intensity of my devotion to them not their active status.
Tldr: disbandment i think doesnt affect my answer to who id bias but other factors such as whether i lose devotion out of overlong stanning/stagnation/growing out of being a fan through different paths, same as my growing out of being as intense a gan of my western faves. To move more into kpop. Same might happen thru overlong exposure if no disbandment.