Biggest problem with a passenger train (or any train) coming off CIND (or the CSXT Indiana Sub for that matter) is that the only way it can go is north out of Queensgate without somehow turning the train or running around it. For Amtrak Cardinal to use CIND, they would have to turn the train on the Southern Loop track - under the BEST of circumstances, going from CP Oklahoma, across CSXT to Southern Loop, around loop and out onto NS Ohio River Bridge, then shoving back into Gest St can take 15-20 minutes. Then you would have to get from Gest St to Union Terminal - I think CIOR's 30 minute estimate is very optimistic. An other option would be for the Cardinal to run with 2 units, back to back, and run around train in Queensget somewhere. But then the you would have an occupied train sitting for probably at least 10-15 minutes in the middle of the yard somewhere with no head end power. Or, Amtrak could keep an engine in Cincinnati and simply trade out power - the new engine ties onto rear of inbound train, and the inbound engine is cut off. Really don't think Amtrak would be too keen on any of those ideas. Best hope for passenger service on CIND is the Midwest High Spreed Rail program - maybe Amtrak can take a baby step and extend the Hoosier State to Cincinnati via CIND to get the ball rolling.
Back to the subject of the thread - if CSXT where to repair their mile and a half or so of track and reopen the interchange today, traffic would likely start moving that way tomorrow. CIND probably could even get the STB or courts involved if necessary to force CSXT to repair the line in order for them to exercise their trackage right. Problem is, there really isn't enough traffic to move that way for CIND to risk their relationship with CSXT by forcing the issue. Now if something developed that was a big enough piece of business that had to go that way, I'm sure they would force it open. Personally, I think best hope for restored through freight service would be CSXT deciding that going through the motions to serve a handful of customers in Shelbyville is not longer worth it and they sell it to CIND.