I think that bitcoin will be for many years the most widely used, I doubt that another currency could make him fall
No other currency will make bitcoin fall. It is the reserve currency and it evolves all the time. It will be there for long term.
Yes for long term but not that long. Geniuses are born and one can create like this in just a matter of time. It is how it will be advertised also. Due to the fact that bitcoin have been advertised wrong from the start that wrong side of this is what will make it fall also. That should be fixed faster.