Of course, but this bill makes it easier for a physian to do so, and enhances its legality.
The bill places an extraordinary number of safeguards: the request for the physician's assistance must be put in writing; at least two people must witness this request; two doctors must confirm the diagnosis.
A lot of things can make it easier, in some remote and highly implausible way, for physicians to kill their patients. Does that justify forcing terminally ill patients to drag out their painful lives longer than they wish?