maybe end of 2015 bitcoin dead

Don't get bothered because of these little crappy reasons. It is just a little problematic because of the price being low and many losing huge amounts of money because they bought at the peak, taxes being a problem, and other unnecessary stuff. It's just a phase and will fade away eventually.
Yes, good days for bitcoin are coming very soon. The only reason bitcoin has been looked down are all the money laundering scams which involved bitcoins had a significant time in media bringing a bad image of bitcoin to the world. However, things seem to improve and people are starting to realize how shitty centralized currency is, hoping bitcoin mass adoption comes soon

I think if the adoption level goes high then there are chances that it will survive for a longer period of time but the basic thing is people should show their interest and willingness to accept the bitcoin as a mode of payment. And bitcoin is going to shoot up like crazy when his going to moon.