What's the point of having a ULTRA secure useless thing? There is NONE.
Expect a good portion of the market to leave out if the value proposition is not keeping up. Myself included. Another system will prevail.
Bitcoin's value is derived from its use cases and every speculator with half of a brain understand that. There is no point of speculating on a coin that have no use case prospect unless you are shorting it to death.
Being useful does not necessary give something value, there are lots of useful air around you but they worth nothing
Same, being valuable does not necessary mean useful, there are many financial instruments that do not have any practical use, their only use is to make the owner richer over time
How could bitcoin make its owner richer? Because it has constantly shrinking supply and the fiat money have constantly expanding supply, so it will always appreciate against fiat money long term wise (in fact it will appreciate against anything, because they all have constantly expanding supply), if it is being used as a currency
Why not xxxcoin? Because the deflative effect will be strongest when all of the people who understand the power of monetary deflation concentrate their effort and resource on a single most mature and popular cryptocurrency. Sure you can use a dozen of cryptocurrencies, but then the effect of monetary deflation will be magnitudes lower, thus any investment on other cryptocurrencies will have a high risk of ruin