I don't think Jericho is that worried about the losses he is sustaining in recent times tbh, he knows he is semi part-time and would have to put people over, he comes across as not minding having to do that as well, I think the thing that keeps him coming back is as long as he gets crowd reactions, he really seems to feed off that and enjoy it a lot
Would love to see him have one last title run though before his days are finished, but alas i can't see that happening, so in short no he isn't done as a wrestler, he's just doing what needs to be done for himself and the wwe at this time in his career