The Macintosh and iPod didn’t exactly get off to the strongest starts either, I would assume that the Vision Pro is doing about as well as Apple expected it to at a price point like that with the very small amount of content available for it.
For anyone curious, the Macintosh saw strong, initial sales based off of hype, and then it pretty much sat on shelves for a year and a half. The first golden age of the Mac didn’t start until about 1989, five years after the first generation.
The iPods took almost 2 years for them to sell their first million units, and didn’t really “take-off” until the iPod mini, shuffle and nano were introduced several years later.