Given it's a college setting where the end goal is graduation and getting on in life, the throuple may succeed through to the end of college, but I doubt it'd be a "happily ever after" situation.
At same time, like all non-harem AVns, you're gonna have to make some hard choices about which relationships to end, but I'd be shocked if that choice resulted in one party dying. DPC would be foolish to do that two games in a row, so I would count that out.
That doesn't mean no one is going to die, it just shouldn't be up to the MC again to choose who lives and who dies. If someone is scripted to die (like, say, Quinn or Riona due to their drug dealing affiliation), that doesn't make DPC a one-trick-pony.