It's worth considering that if it is Montalbán, it could be dialogue from one of his movies, or any one of his other TV appearances beyond Fantasy Island.
From the original post in this thread:
It could be an episode of Fantasy Island, it could be TOS, it could be Wrath of Khan. It could be anything, really, from throughout his long and distinguished career, at least pre-1983-ish.
I'm currently just following up on Coover5's post near the bottom of the previous page, where he successfully found an episode of Fantasy Island with a character named Barnes in it, after robbritton said he'd failed to find any entry on Montalban's imdb with a character named Barnes.
For the record, in my head it still sounds more like "BUT! You may be right..." though enough people have independently stated that to them it sounds like "Barnes, you may be right" that I am willing to make any progress possible, even if it is only slowly crossing items off the list one at a time.
But a show with Montalban, a character named Barnes, and being broadcast in October 1983? That's a very tantalizing potential payoff to several of the most-recurring 'possible interpretations' all at once.
... with the ending sounding like someone singing the words "comes hopes"
I've thought before that the last two syllables might be "compose" but with the plot of this episode of FI, it occurs to me the word might be "propose" because that's what Miss Barnes is trying to get her too-cautious boyfriend to finally do.
Which might mean we're looking for a line where Mr. Roarke says to her something like: "Miss *Barnes, you may be right. If so, he better propose* soon."
Or he could be speaking to his assistant Lawrence (Christopher Hewett as a proto-Mr. Belvedere, replacing Tattoo after Herve Villechaize quit following Season 6). Maybe Lawrence says that Miss Barnes is developing real feelings for Mr. Roarke (again, I can't understand spoken German but I am cuing off of their facial acting and the music, LOL) and Roarke worriedly comments:
"Regarding Miss *Barnes, you may be right. If so, he better propose* quickly."
Either way, we're likely only getting the middle of a sentence.
Just spitballing here. It may all come out to nothing.