Everyday after Sunday that the banks are close Tsipras support will drop. I'd imagine everyday up until Sunday the creditors are working plans with Tsipiras to resolve this issue pronto after the vote.
Neither can afford to prolong the crisis any longer. I'm surprised no one has mentioned that this vote really doesn't matter. There will be plans crafted for a deal when there's a yes or no vote. Just my opinion, but they won't let this thing drag on another week with banks closed. JMO