that has been bothering me too. the group doesn't even give a **** about the others anymore. and I guess i wouldn't either now that they have ben and the others have been proverbially decapitated. But still, where did they go?
I think it's only been about 3-4 days on the island since Ben left the Others camp to go to the Radio Tower. He told them to go to the Temple.
I wouldn't be surprised if we don't see The Others until Season 5.
Also the actor that plays Richard Alpert got a big part on the CBS show Cane. Whether or not he will return to LOST is still in question. If Cane gets canceled I would think we would see Richard again.