I don't see this as a good move for Amtrak. The LSL is one of Amtrak's most crowded trains and the New York-Chicago passengers will be left with the 3 day Cardinal as the only choice. Problem is that the Cardinal is a small train with one or two sleepers, a cafe car and maybe three coaches. That train could not possibly take the additional passenger load. Moving the LSL temporarily to Grand Central station makes the most sense.
Exactly! The tiny, 3-day, frequently sold out Cardinal, would take on the passenger load of a LONG, DAILY, frequently sold out train. There are a lot of people who want a one-seat ride from NYC to Chicago. This will interfere with all of them.