Personally I'm handling this by paying my monthly hosting bill two months in advance. That gives my 2IC plenty of time to move the sites or provide access to my clients' new provider. Also the 2IC can pay the hosting bill. The reason the switch checks weekly is also to stay in sync with monthly bills paid. Nice insights and thoughtful comments. Thanks, calyhre.
Another option for anyone reading this thread is to put the switch on a different host to your main VPS or servers. Cheap hosting paid yearly in advance is one idea under a different billing account or another provider. My switch is hosted in Singapore but the majority of my sites are Australian. So if the Aus servers go down upstream it's less likely the switch will be affected. :)