Dump Peach? Personally I think he'd be better off with Rosalina (not Daisy).
If Mario lived in outer space with Rosalina, then who'd be left on the Mushroom World to save Peach? Mind you, the observatory only passes the planet once a century, so Mario would be too old to save Peach by the time he returns.
Plus, Peach is a very good person to mooch off of. After all, she
is a princess. If Mario lived with Rosalina, all he'd have to eat are those star bits (the taste of honey can get pretty old after a while).