hmm..I don't really like the idea that our characters could die without ourselves having any influence in the process (although that's the whole point of assassination). I would prefer for example if their ancillary was stolen, or they are given a train IG like "confined to bed" to give him disadvantages in movement.
and also there may be a problem of players over-using the assassination system, but this could be moderated by the GM.
you did ask for 'everyone's opinion.