His reports will surely be infrequent, his will be a unique perspective, said reports will be scripted with as many takes as needed to record, and if he does appear at the desk for a de-brief, everyone involved, including the viewer, will be aware of the circumstances and be understanding. I really don't get the hate.
So what if it's only a year or two? I'm not sure I'd be putting money on many local news staples to be viable beyond that timeline, so why should the expectations for this to be any different? As for the reading of notes, that's being mature and proactive. He knows he's not 100%, so he's doing something that helps him retain info better. Hell, many healthy newscasters that are half his age should be taking more notes, these days.
Similarly, folks are within their right to express the opinion that you're coming off as more than a little callous, especially as someone who is almost completely unaffected by this. None of us outside of market #1 are regular WABC viewers, so Bill going on local TV and trying something unique like this isn't going to ruin or make our day. If he, his bosses, co-workers, family, and (die-hard) viewers don't have a problem with this, then it is kind of a you problem.