It's a big deal because many rockets that are deployed don't come back in a useable state and rockets tend to be very expensive. The SpaceX Falcon 9 returning back in one piece means that there's a possibility that we can create rockets that can be deployed and come back and be used again, saving possibly millions of dollars just for building the rocket itself not including the fuel. This marks the first step in creating reusable rockets and there will definitely be a future for them so this landing may be more important than people realize.
I think the land of the SpaceX Falcon 9 rocket is incredibly important. It shows that a space program can continue without NASA. It shows that a private company has the ability to land a rocket safely. If anyone is going to be able to rejuvenate the American space project, it's definitely Elon Musk.
Unless it was somehow faked for PR, any time a free-market company makes progress on a space initiative, it's a positive event. Granted, it would be more positive if the government hadn't given them a huge contract but then again, they were on the brink of bankruptcy before that. Hopefully some real innovation comes out of the company.
The SpaceX Falcon 9 rocket landing proved to the world that launching a rocket and it's recovery is now more economically viable than ever. Many people have been comparing this with taking a flight on a 747, and then having to discard the airplane after its one use. Doing this over and over again would take a lot of time and money to build these airplanes, which is not economically viable. The landing of the Falcon 9 proves to the world that reusing rockets is now a reality and brings commercial space travel all the more closer to us.