Many people on this thread have put forward the argument for assisted dying far more eloquently than I ever could.
If a person chooses to put an end to their life then surely it is their decision to make and no one else's?
To die with peace and dignity rather than begin a slow decline in terrible pain really is that not much of a choice as far as I am concerned. It would (of course) have to be very tightly controlled to prevent possible abuses but it does seem the way forward to me.
After all when a beloved pet is suffering we put them to sleep, we do not let them endure a long and agonising end because that would be far too cruel.