What I say to anyone until to the final table, it really doesn't matter where you are in the field, it can all change in 2 seconds really, you can go deep but you are never guranteed to final table until you are at the final table.
All it takes is a hand where you have a hand of AA vs KK or QQ for instance and that someone has a decent ratio part of your stack and he sucks out on ya, its over., thats just one example theres several others.
TBH though most of the time I see a person dangerously short stacked in an MTT he gets a second live cause of a fishy bigstack making a retarded call. I.E the fish is in BB, everyone else is folded so he calls on 45s, SS has 7 J or some crap and wins, few hands or perhaps even instantly SS shoves again, someone calls but this time he actually has a hand, doubles up again, now hes not in as bad a shape.. I've seen this heaps.
Still a come back is a come back though, good on ya 'that guy'