Just like Bitcoin was launched by satoshi in 2008-09 as new financial system, somebody in future may come up with another idea and we all start following that and abandon bitcoin along with other crypto. That's just one possibility for 2140, we all wont be here 2140 but lets post with hope that this forum will be there in 2140.
Sorry but i don't think Bitcoin and cryptocurrencies will just gone like that and people will abandoned because new one comes out?there
might be another one but nothing can make difference from Bitcoin as this is a currency back by technology
and not just some amount to be spent.
just like banks,why they are staying even there are so many online sort of transactions?there are paypal,paymaya,Bitcoin and other
form for payment yet Banks still lives and making money from the users.
if i am to support your position?maybe not to abandoned Bitcoin though i
doubt that i am still alive and active that year.