If you believe that standard English is wot people have been using for hundreds of years, you have to accept the use of "hopefully" in the sense we're arguing about. It's been used that way for at least three hundred years, though its use in that sense burgeoned in popularity in the 20th century. Here's an extract from Merriam-Webster's piece on the word:

Hopefully when used to mean "it is hoped" is a member of a class of adverbs known as disjuncts. Disjuncts serve as a means by which the author or speaker can comment directly to the reader or hearer usually on the content of the sentence to which they are attached. Many other adverbs (such as interestingly, frankly, clearly, luckily, unfortunately) are similarly used; most are so ordinary as to excite no comment or interest whatsoever. The "it is hoped" sense of hopefully is entirely standard.

I don't like it any more than you do, Vincent, but, hopefully, we can at least agree that the fight is lost...