One of the biggest roadblocks in my mind to space travel is first of all, the re-usability of the vehicle. It gets expensive if you have to basically build a new platform everytime.
The Space Shuttle was the first step, but reading what they had to do to get it up again, it sounds like they might as well have built a new one every time.
Even with SpaceX, we're still talking exploitation and not exploration of space, I know its a step to getting there, but its basically a freighter or school bus. But at least it sounds like its re-usable.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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