Others have suggested that disabling the button entirely (either not rendering it at all, or simply changing it so clicking does nothing) will be confusing to a lot of users and likely result in a lot more meta questions.
As I said in a comment on the previous postin a comment on the previous post, instead of removing the button, why not add a tooltip which shows the number of seconds remaining? Currently the only way to check if the submit will work is to try, so why not tell me right when I need to know (when I move to click on the button)?
I agree with Mr. Rudy that the new behaviour is insane. It will likely result in the defenestration of a keyboard before the week is out.