I remember Iain getting proper annoyed at the "Accidental Partridge" guys, because the things they picked him up on were never accidental. There's always been a key difference between Iain and the likes of Madeley in that Iain is a comedic performer. He's aware of a lot of the tropes of what he believes is bad radio, and he often leans into pretending to be a bit out of touch etc to get a laugh - and it's usually pretty signposted as deliberate if you're looking for it.
There's definitely a Partridge trajectory to his career though, I can't deny that. I think the way he talks at the moment it's more likely that he'll get out of the limelight entirely than present The One Show, but you never know, eh?