I just kinda fear for it actually gonna happen given his favoritism by Raiku lol. Not that I really dislike him overall but if possible i'd prefer other millenium mamodos like Pamoon or Laila more
The doctor seems to have age catch with him more than before, so having him spend himself for this fight definitely doesn't match.
Would be interesting if he still revives Kido later on and has Vino work with him in his stead, but at least having someone else show up unexpectedly and demonstrate how they've grown is a very nice decision IMO.