The only reason i can think of regarding the dropping of LDY - ALC, is that RYR must see a better opportunity elsewhere for the use of the aircraft from the ALC base.
The pax figures from the entire 2010 ALC season are very good, so i'm wondering if it could be suited to a charter operation from Thompson in the coming years? They seem to do very well on PMI and REU from LDY with LF's around 90-95% at peak times. Maybe even Europe Airpost could start something as well.