I have zero interest in Esperanto. It solved absolutely nothing and represents a sterling example of naivety, Bitcoin on the other hand actually solves serious problems.
Can't argue with that, Esperanto is really mainly idealistic (but I find it interesting anyway for its simple and conclusive grammar; I'm not fluent, though).
It drives me crazy that people refer to Esperanto as culturally neutral. It's a Western European language based on western European grammar. English is far more culturally neutral because it is influenced by Latin, French, Germanic languages and so on. English absorbs any culture it comes in to contact with.
It is not neutral of course, but its creator at least tried to bring more than just western Europe into it - at least some words are apparently based on Japanese. Of course, it misses a lot of cultures like Africans, South Americans, Indian and I guess a lot more. However, I don't think English is more neutral - it is true that it is based both on Roman languages (to 20%) and Germanic languages (to 80%), but so is Esperanto being based on all of those languages, too, even including Slavik ones and Japanese as mentioned already.
English is unparalleled for it's ability to adapt and describe complex technical concepts. There is a reason why English is the international language of aviation even though the French were the leaders in the field for many of it's early years.
I'm not sure whether to agree here or not. Of course I'm used to writing technical stuff (be it related to computer science of my research in mathematics / physics) in English and don't even know German words for some of the concepts involved, but what exactly makes you think English is naturally the "perfect language" for technical concepts? In terms of simplicity, English lies between Esperanto and German - so depending on whether you think it is good to describe things in simple or complex sentences, you should prefer one of those over English.
Before WW II, also a lot of science was published in German (for instance with the "fathers" of quantum mechanics being mostly from German speaking regions as far as I know) - I believe the main reason we use English today is simply because a) Germany lost the war and English-speaking countries were the winners (which is arguably true also for French and Russian, though), and b) the English commonwealth empire was were large and influenced large parts of the world (former collonies like India). I'm not a historian though, so that are just my "uninformed" impressions.