50k won't happen for a very long time. It will happen, just not for at least a VERY long time. By the time the last Bitcoin is mined (2050), 1 Bitcoin would probably be worth 20-25k at the max. Then the transaction fees/SND comes into play, which would still take years, if not decades in order for Bitcoin to hit 50k. Bitcoin will not die though, I can almost guarantee that. Just an estimation.