Sleekit said:
Blackberry was never a mainstream product.
That doesn't actually seem to be true... Yes, it's reputation at it's height (and since, for some people I know) was as a quality business product, but it's sales were very much mainstream.
As the article in the OP points out, Blackberry market share in the US was once in the 50% region. Or to pull a quote from Wikipedia "In the United States, the BlackBerry hit its peak in September 2010, when almost 22 million users, or 37% of the 58.7 million American smartphone users at the time were using a BlackBerry".
It may have been most popular with business folk, but 37% is not a niche market. Even now, if you've got a product with 22 million users, 'niche' is hardly a term that applies. I never found them particularly impessive, but they definitely had the mainstream thing going for a while.
Hell, I still know people (non-business types, mainstreaming common folk of the most common variety) who got their BBs years ago 'because they were cool', going with the 'fads' of the time, and are still stubborningly clinging to the things.