* You're much better off with a list of people who actually care about your communication and your product, rather than a list of people sort of interested or downright annoyed by you, which haven't unsubscribed because they couldn't find the link.
* Less disinterested subscribers means less costs to send and maintain the list (e.g., via Mailchimp or SES).
* Less spam reports which hurt your email deliverability (get enough of those and you'll be booted off sites like Mailchimp).
* People will have less unwanted commercial communication overall, and will be able to focus on yours (of course I'm talking about the selected group of people who are actually interested).
I welcome this change, and I say this as someone who runs a site that sends 50,000+ 'newsletter' emails per week. This to me is good news.