Ah, I see; the time it takes to go from A -> B is so insignificantly small that the mind isn't capable of processing it, thus not noticing it, correct?

Fabs

science

What possible future (technological) breakthrough might be a grave mistake?

Hm...interesting approach
But I think different (sorry if our opinion does not match)... I think it is not required to mind to shut down, because the mind does not conscientize the "travelling" because of the short time (fractions of seconds). 
In my opinion not the mind is the most important factor here, but also the time. If we surpass the lightning speed, time stops (this is also just a theory), and our mind have "no time" to react to this change (the travel with teleportation) => our mind does not shut down :)
This was just my opinion, not supported by any scientific evidence
