We had the same discussions when "One To Say Goodbye" was supposed to be on the Box Set
I still think that we will never get a farewell tour and that we will never get a farewell album. They do another tour and another album. And either there will be something to follow up or not.
Jon knows best that he can't let go. So he will keep all options to go on and not making a fool of himself when he has to announce a comeback after they already retired.