Can somebody just promise to back the price up?
Say, somebody with a real name (or a real company)
could issue a legally binding obligation to buy BTC
Why would ANYONE want to do this?
What have they got to gain from buying coins from people that could be essentially worthless? Apart from that they have to buy them because they promised everyone they would?
In an ideal world, this would be nice. But in the real world, this will never happen. But hey, if you want to sell me all your bitcoins right now for $0.10 each i'll gladly accept =D
So, what's to stop your USD or GBP or any other currency from turning completely worthless with the current rampant inflation? People still massively trust those, even though their *actual worth* is falling every day.