"doin really really well" is relative, if it was always planned for a 1 wave theme, then maybe its doing well as a 1 wave theme.
If it is the end of lotr then I must say they could have released some other set than "orc forge" For example something with Faramir and his rangers, wouldn't require any new molds. or maybe they just needed a 'boring' set so they wouldn't hide away the good stuff for all consumers.
LOTR was the big lisenced theme summer 2012,summer 2013 'the lone ranger' will take that spot.
Either way, if it is going to end I would think a D2C set would be in order, it sounds like soemthing lotr lego fans would be highly interested in.
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Radagast, lets hope hes a hobbit wave 2 minifig.