I'd much rather do it myself than face the bureaucracy, stigma, high requirements and other bullshit related to getting permission to end my life. Not to mention the emotional burden of fighting for this right and knowing a date afterwards, I'm someone who prefers to do things without a plan anyway.
The fact that I have to get the approval of unrelated people in order to have some dignity is enough to make me completely discard this option, even though I will qualify once my condition deteriorates further, which is a inevitable and only a matter of time.