Not sure if Pence dying would have made a difference there actually. There was already an insurrection, so if martial law is what he was after, he could have just used that as an excuse regardless of how successful the insurrectionists were.
I like to think that ‘we the people’ wouldn’t tolerate a Trump instigating an insurrection and then calling for martial law on the basis of that same insurrection; but it certainly wouldn’t be the first time I’d have been disappointed at our collective lack of a spine.