It's more or less a pipe dream. This venture will cost in the tens of billions before they even start mining and the return from the investment might not be worth the cost depending on what they are mining. The biggest benefit will be the milestone for humanity in general to accomplish this and the ability to streamline the process to make it more affordable for future investors. I still say it should be done, but I don't think anyone should fool themselves into thinking that scarcity for certain resources is going to decrease anytime over the next few decades.
Oh, also they will need to develop a reusable ship like the space shuttle that can go back and forth from the asteroid to actually deliver the material to earth, unless they plan on putting it in a box and just shoving it towards earth.
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