That's what "nothing" means, my friend. I can write some words on a piece of paper and tell my little 5 year old niece it's money and use it with her. That doesn't make it valuable...
Sure it does. As long as both people agree that it is a token that represents value and it is honored, it will become "futureofbitcoin" fiat currency with the utility of demarcating an IOU which does represent value (although rather small).
I will personally buy all bitcoin that gets minted if no one else does. It will never go to "nothing"
The two person example was a worst case scenario as well as the number of bitcoin fanatics that are unlikely to stray from this project amount to between 200k-1 million of the 4-7 million bitcoin owners. That is a decent market of ideological supporters that can maintain and grow it regardless of what obstacles are presented.
See, you're arguing semantics, not the point itself. One shouldn't need to type "bitcoin will have less than 4 users transacting values of less than 50 dollars (USD value at 4:33pm EST, May 11th, 2015) per week..." It's extremely tedious, and unnecessary. Most people understand that "nothing", or "bitcoin is dead" simply implies that there will be very few people using it, if at all. Bitcoin doesn't have to literally become "alive" scientifically, then "die".
I suspect that there are way fewer number of hardcore ideological supporters. Most probably sympathize with the ideology, but will give up if they realize that bitcoin becomes impractical because very, very few people accept it. Plus all the services that are run by people driving by profit instead of ideology will close down, breaking most of bitcoin's infrastructure.
It might still be used among a few thousand people. I think most reasonable people would be okay with calling that "bitcoin is dead" or something similar.
*Note i'm not saying the above scenario will happen, I'm just trying to explain that saying "bitcoin will never go to nothing because I will always own it" is silly. arguing about the semantics is not practical or useful in any way.