Bigbang as a group may or may not be over but not for them as an artist. They will continue to make music. It’s their thing.
One thing I noticed in their New MV is them walking to somewhere. So it means they have a direction they want to go. When you look at each verse they sing, they are all in one place not really moving or going anywhere. Taeyang in a boat, Daesung in a room, GD in a stage, and TOP on the moon. But at the end you see them going walking away (Daesung and GD) or Taeyang finally on land and TOP disappearing somewhere (I’d like to think he went back to earth since he looked at that direction a lot of times).