Have you read what it would take for us to make the Orange Bowl? Or you're just seeing the words "Orange Bowl" and are assuming we can't make it?
I'll assume the latter, so let me summarize the Herald and PBP reports for you. It's actually extremely realistic.
1) The OB has to take the ACC champion, unless the ACC champion goes to the CFP.
-> Clemson is almost certainly going to the CFP
2) The OB then has to take the highest ranked ACC team, per the CFP top 25.
-> There likely won't be any. Currently there aren't any, and the only teams that still have a shot (Wake, UVA, Pitt, and VT) will either all play each other, meaning they will lose another game to a mediocre team, or still have to play Clemson (regular season or ACCCG), meaning their last game will be a blowout loss. UVA, Pitt, and VT are all locks to end up with 4+ losses, and Wake is looking like a coin flip between a 3-loss season or a 4-loss season. Without any big Ws, Wake will probably be unranked in either scenario.
3) In the case that there is no ranked ACC team besides a CFP-bound ACC champion, the OB can take whichever team they want. I believe the team they choose needs to be within 1 game of the team with the best record that does not get selected, although I'm not positive about this
-> Per SP+, Miami has a 65% chance of winning its last two games. I think most of us would be upset if Miami lost to either FIU or a slumping Duke team. It is reasonable to expect Miami to win its last two games and finish 8-4
-> In that case, Miami would be at 8-4, with every other team either 9-3 (Wake), 9-4 (loser of ACCG), or worse. This makes Miami eligible for the OB
-> I don't know which team the OB would prefer (9-3 Wake, 9-4 or 8-4 VT/UVA/Pitt, or 8-4 Miami), but I think we would have a good shot
Which part of that seems unreasonable to you? It hadn't even crossed my mind as a possibility until last night, but once I read the details it seems extremely plausible.