It may be the business class cars will go to another train. Amtrak is juggling equipment with most trains needing eith 3,4 or 6 car of the same type to install that car on any train. The other possibility is that that the BC cars need some required definite date servicing like brake COT&S.
From Facebook; certainly doesn't seem to make much sense:
My bro in law who drives Amtrak trains told me that Amtrak is talking about ideas is to eliminate 448/449 then replace with one of Empire Service train that will run from Niagara Falls and it'll run all way to Boston, reason: To boost ridership and create more revenue and less deadhead moves like they do normally... If this is gonna happen, 48/49 will just run normally no more hour and 15 min wait at ALB for 448/449 once for all. Also, I can see possibility it'll have sleepers and cafe on this new route and a business class car. If this is done, I'll surely go buy ticket because one seat ride = more ridership.