no, i am just afraid that this is going to be the common use case. Or that some other opportunity for abuse will be found, it's a very slippery road...
What all the data says is that most of assisted suicide cases are people suffering from horrible incurable diseases.
All Dutch euthanasia procedures are documented publicly. The documents include patient's condition, circumstances surrounding the request, assessments from multiple physicians, and the commission's judgement. They do not include the identity of the patient, for obvious reasons.
One gives you a choice, the other one doesn't. If you want to prevent abuse, make it difficult in the law. Restrict it to advanced directives, require a psychological assessment, etc.
The scenario you're describing is the easy one — if I have people who love me enough that they're willing to care for me, I wouldn't feel forced into making this decision and there's no risk of abuse. If anything, I might feel pressured to stick around to avoid hurting them.
GP's argument is trickier: Callous family members might want to force me into accepting assisted suicide against my will, because they don't want to care for me. My point was precisely that, in that position, I wouldn't want to be cared for by those callous relatives, and might choose assisted suicide of my own accord anyway.