"Good" is usually an adjective (minus the few times that it can become a substantive) and in a sentence such as "I'm good," good modifies I, with "am" being a state-of-being verb that cannot be modified in such a construction. The adverb "well" should be used when the state of condition is dynamic or the verb is an action verb, such as "I am doing well" or "She did well on her test."

Perhaps there are other exceptions to this usage, but I did not see this discussed in the article.

Oh, and "one" can also be used as a singular, unisex pronoun, although that can lead to stiff, archaic speech on occasion.

As for "hopefully," it seems to be a vestigial remnant of a subjunctive clause. I was reminded of the Spanish "ojalá," which is a marker for the present subjunctive to be used. Naturally, we tend to put the main phrase in the future indicative. Hopefully in the future we will see the return of a stronger English subjunctive, but I doubt it