2006. I think the That's Entertainment free dance that they ended up dumping the next season signaled the beginning of the end, even if I really enjoyed their replacement Amelie free dance and the Chopin free dance from 2008.
While they do have a silver medal from the 2009 Worlds, I wasn't wowed by either of their programs in LA. Same with this prior season, even though I do think they deserved the Olympic bronze. I think Linichuk & co. just sent them in the wrong direction-- especially that original dance from 2010!