10JQKA, recently retired en-route. Standard alternate routes are usually the way it's handled. Generally it's not just sprung on us so we have plenty of time to plan. As to the weather, etc, well we have to play that by ear. Of course it adds to workload and complicates things but that's what we're paid for.
I suspect this is part of the development for OneSky - the intention is for a more dynamic use of restricted airspace than we currently have once we're all using the same system.