"Soon" would be in the next 1-3 years or so.
One of the biggest dangers for BTC is something more useful coming along and investors switching - a process which could happen extremely fast, once started.
So to all the tech savy people in here - what advantages could other cryptocurrencies bring that will give them a crucial edge over BTC, and how fast could something like that come along?
For now, and maybe for the next 3-5 years later bitcoin will remain dominating the market. But, we can not close every possibility that might be come. Maybe theres something better than bitcoin that can replaced bitcoin, or bitcoin will remain strong, we just can not predict it.