As big an Alonso fan as I am, if anyone is going to threaten Schumacher's 7 WDCs it'll be Vettel. Schumacher won't get involved at all, we've seen him this season leap out of the way of the leaders when he's been getting lapped, never getting in anyone's way when he doesn't need to.
I'm tempted to throw a few £s on him taking the WDC next year though.
I had £10 on him this year at 5/1 :)