Not sure you're seeking discussion (just argument)
You're very wrong. You'd rather the issues be closed, decided and never come up again but that's not reasonable. All these issues very much need to be discussed, and continue to be discussed, and continue to be discussed, as every new technology and treatment changes the reality of what is possible, and what is ethical. The issues we think are tough decisions today will probably be decided, but new ones will evolve.
What if, through some new regenerative or stem cell therapy, that we could grow new brain cells in a brain as damaged as Terri's? They would not necessarily have Terri's personality and would not have her memories, but they would be in her body. Should we do that?
If we could do brain transplants... should we? Would that be a new chance at life for the donor, or the donee? What makes us "us"? Our bodies, or our brains?
The times ahead will be interesting I'm sure.