It appears they have been accepting BTC for about a year, it’s just the link is hidden at the bottom.
I think this needs to be up near the PayPal section, that way when people see it, they will be curious what Bitcoin is and start reading up about it. Thus, not only is this thread about Wikipedia accepting BTC, which they already do. It is about spreading awareness of BTC.
And that's the reason why they won't make 'donate with BTC' too visible. People who are about to donate get distracted and start checking what the bitcoin is (abandoning the 'donate' site).
That's what happen to Mozilla, they've run some test analysis for 17 days when Bitcoin was listed along with other payment options. Eventually they also decided to hide it. Can't blame them really, their goal is to get more donations not to promote bitcoin.
See my post from other thread:
I know that they are accepting it if you do some research BUT why hiding it ??
...
Why? Likely for the same reasons Mozilla removed bitcoin donation button. It distracted page viewers resulting in less donations.
https://fundraising.mozilla.org/bitcoin-donations-to-mozilla-17-days-in/
The test showed that revenue per visitor drops by about $0.07 USD. Here is the Optimizely graph showing a 7.5% reduction in revenue per visitor:[...]