It should be noted that these guys aren't JUST complaining about the microtransaction issues. That is a big part of it, but there's also issues with player balance, connectivity, and various other things that are making fans mad.
In any case it looks like their plan worked. Ubisoft acknowledged that they saw the planned blackout thread and went over the complaints and said they're going to try to address them. They already made some changes in response.
http://kotaku.com/as-for-honor-players-threaten-a-boycott-ubisoft-offers-1793843782
It's great that Ubisoft is making their fans feel like they are being heard but I highly doubt the 11,000 people who upvoted that boycott idea were going to make any noticeable impact on the overall player base. Still it's far better to get the community on your side as much as possible instead of letting this relatively small group of people fester into a larger problem.