The good news about this breach is that it will greatly increase their "active user" count because of password reset logins. That looks good for the buyout deal.

Twitter did this to me right after their last not-so-great quarterly report came out: sent an email saying they have noticed "suspicious activity on my Twitter account and have suspended it. Click this link to reset your password." Which is kinda funny because I never posted one thing to my Twitter account. So locking it for me was the next best thing to deleting it.

When I got the LinkedIn breach email, I too just deleted my account there. Wasn't worth the fretting about security problems.