Yes. I've just gone and done this. You never know when that fatal bus flattens you. I seriously doubt anyone else will have a clue what to do but they can look at those strings of numbers and remember me fondly.
Once they find out the fiat value of your holdings, they might start thinking about it some more...
I think there are lots of coins disappearing forever after the death of the owners.
Absolute disaster for them if they hold a lot, but it's good for us. Decreasing supply --> scarcity --> increasing price.
The good thing is that the decreasing supply means that people tend to own less coins each and they have a higher value, so people are less likely to lose them.