E-mail marketing is as relevant today as it ever was... and that won't change in any foreseeable future!
Not building a list of prospects or buyers, is marketing suicide... and relying on social media followers or fans is like driving your car without insurance and hoping you never get into an accident.
With an email list you have the benefit of direct access to people inboxes rather than a feed or an ad that has a lifespan of a few minutes to a few hours at most.
Now you can argue all you want about spam filters, deliverability, and all that jazz, but I am talking about a buyers list (or prospect list) which are people that have opted into your list hoping to hear from you or waiting for you to follow-up with them as a customer.
When you have your own e-mail list you have an instant audience, on top of all the other sources, and built-in authority that you can leverage to your benefit and contact as often as you like... assuming you provide good content and 'real world' value.
In other words, spamming people with endless, useless offers, will kill your list just as fast as Facebook can shut down your fan page or limit the reach of your posts due to lack of engagement or people indicate that you are posting poor quality content. Yup, the days of blasting spammy content all over the web is almost over... thank God for that!
With the right balance of "great" informative content, relationship building, and sharing of good "helpful" offers, your e-mail list can become your own personal fan base of people hungry to hear what you have to say and offer to them, and they will thank you for it.
Imagine having a second full-time income just from sending emails to a list of only a few thousand people... yes, it can be done.
Igor Kheifets, a top affiliate marketer, earns well over 1 million dollars a year from his humble e-mail list of only 16,000 people... while other marketers with 100's of thousands of emails barely make a fraction of that.
Yup, he is proof that it is never about numbers, rather it is about you and the quality of what you deliver.