I'm gonna go ahead and use my status of someone who played, completed and thoroughly enjoyed Nuts and Bolts to say: No, vehicles wouldn't be a good idea.
Look, as much as I loved NaB for what it was, and that I think it was legitimately creative and awesome and horribly under-appreciated, people aren't just indifferent to the vehicle gameplay; they hate it. They want nothing to do with it. NaB's very poor sales reflects this.
Of course, the chaps already said something to the effect of them not doing anything that you wouldn't expect to see in a platform game, so I'm not worried.
Wouldn't mind seeing a NaB sequel from the current Rare though. Let's just keep things separated, hmm? Don't turn things into things they're not.
"Tiny creatures far below, which of you'll be first to go?"