At a moment I don't see any competition to bitcoins as it is ruling the digital world and altcoins cannot be compared to bitcoins as they cannot be used for shopping or converted to fiat and in that case bitcoin holds upper hand over the altcoins.
Certainly, bitcoin is the only coin in a crypto currency which can be concerted into fiat vice versa. However, it's not impossible that a crpto currency coin can have ots exchanger since the market of crypto currency is spreading annd developing.
that just shows like many blinkered bitcoin users; you don't get out much
plenty of cryptos can be directly convert to fiat without the use of bitcoin, in fact litecoin, eth, etc, even doge are much easier to do so as they actually arrive
That's right , many alts have nowadays a fiat exchange you can use!
Althugh BTC is the best for the moment , it needs competition ! Just as fiat conquers vs fiat , BTC needs a an alt to fight with! And let's see how ETH will evolve in this race !
I can just say that there will be a moment when another coin will surpass BTC ! It is mathematically impossible to be the 1st everytime.
And what can we gain or bitcoins gain if it gets an altcoin as competition? Nothing. Unless that new coin is recruiting non-bitcoin users, we're just going to be playing by ourselves. It will be much better if we all just invest in bitcoins rather than have bitcoin price go down because of a new coin. We will all make better money if we help each other and stick with bitcoins.
With the new coin, there's only 2 scenarios. The first one is that bitcoin users will migrate to that new coin, making bitcoin have much lower price. The second one is if the new coin will get money from the new investors. Imagine if those investors invested in bitcoins instead. The whole bitcoin community would've made money already.
And for the last paragraph, mathematically? How do you even calculate the possibility of something being the best one every time? I think it's possible for something to stay as the best thing that exists in that certain field maybe not forever but for a really really long time.