Hi Jen,
Unfortunately it's not as easy as you're probably hoping for...and not knowing who Dennis Duffy is...I can't respond in his voice 🙂
That being said, it is possible if you're willing to roll up your sleeves and put in some work. Here is where it gets fun. Your blog subscription form will post the data submitted to Marketo, and you'll add the leads to a program.
If you're using a platform such as WordPress, you can use their API hooks to call an action every time you publish a new post. In that action, you can grab the post details (Title, URL, Excerpt, etc) and push them to Marketo in a SOAP call that would update your program's tokens. For example {{my.blog title}}. Upon successful update of the tokens, you would then use a second API call to request a campaign that would actually send the email with the token values to the program members.
For unsubscribes you could direct them to a Marketo landing page with an option to no longer receive blog posts and use this logic in your send campaign. Hope this helps!