The protocol I suggested above, is safe and secure and a very good compromise saving everybody without taking rough measures against people who miss deadlines. You need to take another look at and sleep on it, imo.
if something were broken it must be removed right away. you can't compromise the entire multi billion dollar worth of system just because some people might be lazy!
when people enter bitcoin world the first thing they learn is that they are now responsible and in full control of their own money. that includes keeping an eye on development of bitcoin and changing directions if needed.