As far as I heard and this was a while back mind you. From what I understand Cedar Fair wanted to see how the Timberliners run on Voyage before they decided to do anything with the ride. I also heard that they contacted Gravity Group and Intamin to look at what they could do by re-modifying the ride.
They have put a TON of money into that ride. They have two options: Take the massive loss and have a huge empty space in the park or wait, re-modify the ride, add Timberliners and watch it back in action within in a year or two.