although I don't agree with most of what you said,
I have to agree with you there, life extension is definitely what stands between the human race and the stars,
lets face it, if you had a life expectancy of 1000 years, then the idea of spending a 100 years or so traveling somewhere like Alpha Centauri (or anywhere) becomes a hell of a lot more feasible.
especially if you can work out a way of doing long duration sleeping, or that techniques some monks i read about somewhere do that consumes less energy than sleeping, or whatever.
Space is awesome, but it is mind - bogglingly huge, "space is big. space is Really Big. you may think its a long way down the road to the chemist, but thats just peanuts to space"
the initial costs are massive, and I don't know that the human race are capable of getting more than the first couple of pokes past LEO, perhaps never.
with the problems facing the planet, and the human race, the biggest tragedy that I can see occurring is that we will so focussed on the short term, that by the time we realise we need to harness the availability of resource in space we won't be able to.
I would imagine that if people were more like insects, or there was less of the whole "dignity of self", without getting too utilitarian, it would be easier to get to space.
this is why I believe that any race out there that are space - faring, are much less likely to have a society of "individuals" and instead be more like insects with a ruling class perhaps and then multitude of workers.
it would be free for us to get to space if everyone was "happy" to work towards the common goal for free, whether that is mining the land, providing resources etc.
it gets a big communist, but also reminds me of another saying "slavery gets shit done"
the biggest problem with capitalism / free markets is that unless its something that makes you money it quickly gets "too hard"
if you didnt have to pay for any of the resources, and you had the full supply chain from food through to tech workers, factories, scientists etc. and nobody had materialistic goals,
then bulding a giant fuckoff ship to get to mars would be feasible, so would seeder ships to other systems, because it was "free" as the resources on the planet allow for.
but for the meanwhile I don't think we as a race have a mindset that is capable of putting together giant projects.
I was going to use the pyramids as an example of how you need a driven leader and lots of free labour to achieve truly massive feats (unlike the car and the plane which could be built in a garage)
but then I read somewhere recently that the pyramids may have been built by sub - contractors.
but yeah. I am among many who desperately want to see a push beyond LEO,
I don't expect it will happen, but if someone discovers some way for it to happen I'll be the happiest man off the planet ;)