SES has replacements being built now. Probably gonna be 2 years until they are launched.
Last time I checked, the satellites move in a figure of 8 pattern known as "the box". There might be enough movement to cause this to be a problem on "small" dishes. We had a lot of problems with Ku back in the 80's because of this - even with 6 meter dishes.
Yes they go in a figure 8 pattern that gets larger and larger then about every 2 weeks they perform maneuvers to put it back in center of box. If fuel is getting low the pattern may get larger as the spacecraft owner tries to extend its life and conserve fuel. Small dishes up to a few meters are not a problem for a healthy satellite but larger dishes around 6-7 meters and up usually need to track. I had a 7m Ku dish at a low look angle that I locked down at center of box and it ran for years without tracking. The beacon levels varied about a half dB here and there worst case. I had larger dishes, 11 and 13m that had to constantly track otherwise they could drop a couple dB in level over 8hrs when the spacecraft is at its worst inclination before station keeping maneuvers. I think the half power beamwidth on the 13m at Ku was around .11 degrees.
