I agree that such optimistic scenarios are possible; my gloomy comments aren't meant to prophesy certain doom, but rather to shake what I perceive as an unwarrantably high level of optimism and lack of consideration for certain ugly but nevertheless real possibilities.
Still, one problem I think is particularly underestimated in discussions of this sort is how badly the law of unintended consequences can bite whenever it comes to the practical outcomes of large-scale social changes and interventions. This could be especially relevant in future scenarios where the consequences of the disappearing demand for human labor are remedied with handouts and redistribution. Even if we assume that such programs will be successfully embarked upon (which is by no means certain), it is a non-trivial question what other conditions will have to be satisfied for the results to be pretty, given the existing experiences with somewhat analogous situations.
The question that the ideas are supposed to be in response to is:
Here are links to some proposed ideas that you should vote for, assuming you agree with them. You do have to register to vote, but the email confirmation arrives right away and it shouldn't take much more than two minutes of your time altogether. Why should you do this? The top voted ideas from this request for ideas will be seen by some of the top policy recommendation makers in the USA. They probably won't do anything like immediately convene a presidential panel on AGI, but we are letting them know that these things are really important.
Research the primary cause of degenerative diseases: aging / biological senescence
Explore proposals for sustaining the economy despite ubiquitous automation
Establish a Permanent Panel or Program to Address Global Catastrophic Risks, Including AGI
Does anyone have any other ideas? Feel free to submit them directly to ideascale, but it may be a better idea to first post them in the comments of this post for discussion.