Is it due to their brand stuff? Even fnatic had roster changes despite having a dynasty. Prx didn't even win any trophy with theirs.
They're one of the most popular orgs in terms of bundle sales, and their roster has a pretty good brand in Asia. I think it'd be more worthwhile to keep this roster, and continue to reap their popularity, while trying to make things work. If they were to blow the whole roster up, the whole "W gaming" brand disappears and that in itself is worth more than winning championships, monetarily speaking.