So, NASA discontinued the shuttle fleet. But what will come after the shuttle?
I think the retirement of the shuttle will draw a line between 2 types of space exploration- government-led before it and private company-led after it.
Of course NASA will still lead the whole thing, but it's time companies start exploring the final frontier.
They might have creative ideas and years of know-how in engineering, which will lead to safer, more efficient spaceships. There could be competition among the companies, as a result creating low-cost spacecrafts.