I don't understand the reason for such an extended timescale.
I don't understand the reason for such an extended timescale.
Most Americans think that NASA is 10-20% of the federal annual budget. Most Americans want NASA to have less funding, do fewer things, and take longer doing them. If you want to have NASA move faster, you have to spread the knowledge that NASA is cheap. Then NASA can move faster. See efforts like penny4nasa if you want to help!
As it says in the article, they will be leveraging proven technologies, but have not yet solicited proposals for instruments. This means they are still at the very beginning of the development process, and more money would only help so much. That's why the planetary.org post says that a higher budget would only move the launch date up 2 years. If they had started on a new rover 6 years ago with adequate funding, then we could be looking at a new rover in a year.
Which I disagree with as a result, because as soon as one of those few big things fails (which is inevitable no matter how smart NASA is), there are going to be massive Congressional investigations and talk about how NASA is wasting our money and how they need to be even more careful, which just means they have to build even bigger, even fewer, even more expensive things that just attract that much more attention when a failure happens.
On the other hand, they can lose a $300 million project entirely and no one blinks an eye.
* Operating their current missions http://www.nasa.gov/missions/current/index.html
* Designing and building future missions http://www.nasa.gov/missions/future/index.html
* Public outreach/education
http://en.wikipedia.org/wiki/Budget_of_NASA
It costs a lot to engineer and operate things that work in space.