Faetyl was convinced afterwards to continue the UI (see
this post). Haven't seen him in a while though, can't say whether he left for good or is just taking a well deserved break. He's still logging onto the site though so not all is lost.
It is difficult to keep the motivation up to support a UI if you are no longer playing. Same for me, I'm no longer playing, one of the reasons why ProfitUI updates are taking so much longer than they used to...