Mike, this does not directly answer your question of Erik answering your e-mail, I can say he was set-up with product at the O Scale March Meet in Chicago. He was available at all times taking questions and speaking with people. So if your question is really more in line with "is he still in business" then the answer is yes.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .