I really hope this 5 hours rule will never get implemented so strictly.
I already gave my opinion on this via this post: Incentives and payments for making SNOs stay
There are many situations where fixing a node within 5 hours is simply impossible (for home users at least) : When at work, when in holydays… when sleeping! 
It makes sense to apply some penalty when a node is offline, and the longer it’s off grid, the bigger the penalty. But disqualification should be applied only when the node fails audits or has been away for months… IMHO 
This said, I do agree that emails should be sent as soon as possible by StorjLabs if a node turns out to be offline, so we can solve the problem ASAP if we can 