The "dead man's switch" which would effectively destroy the funds in the future is interesting. Assuming whoever it is doesn't do it themselves, would anyone actually make the effort to feed that transaction into the system?
if it has a significant transaction fee added then it certainly will, I assume if you are doing this then you make the transaction fee e.g 100BTC and it guarantees it will be mined. If it is not mined then no one can access the funds anyway so for the miner they may as well take the mining reward than ignore the transaction.