Yes, there have been some discussions, but they are all over the place. 
You can find them by searching for “Scanscnap” or “Brother” or “Epson” and so on.
Some of the replacement alternatives can be found at:
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Brother ADS-1000W Review - there are several mentions for this model in this community.
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Brother ADS2800W - that is what I use in the office
Or you go with an app (if you do not scan too much on a daily basis):
Disclaimer: some of the hyperlinks above point to posts I have written. There are a lot of posts from other users pointing to scanners as well.