Depends on the reason for disbanding. If it's something reasonable (such as aging, starting a family, etc) then I would accept that and move on (but still listening to their song of course
). But, if it's something that's unreasonable or silly (such as a fight, etc) then I would try to contact them, thru fan mails, twitter, email, heck, maybe I'll go to Japan if I have the money, time, (and if they won't listen with other ways), and try to talk with them.
Sure it may seem over-the-top, but since SCANDAL have done much for us with their music, I think this is one way I could repay them should such condition happen.
P.S.: Don't worry, I'm a pretty reasonable guy. I won't go berserk if they disband. I just want to help as much as I can as a fan (without humiliating myself or the rest of SCANDAL fandom. I will just try to talk to them persistently, and nothing above that
)
P.S.S.: Sorry for the kinda long post fellas .____.