I'd have preferred Chase to take Foreman's offer to head his own team, to be honest. In my personal narrative, Chase stayed on as heir presumptive to Diagnostics and took over when House--for whatever reason, but most probably because of health issues; I don't expect him to live to sixty--stepped down in not too very many years. (But then, I assume a quasi-familial relationship between Chase and House that the writers evidently don't.)

As it is, I'm hoping there's still room for some form of friendship with House in his life, even though he's outgrown the need for a mentor. Writing their interaction as peers is an interesting prospect, and I liked the reversal here: Chase stays because House needs him--possibly to operate, but definitely to handle whatever cases he can't during Wilson's illness.