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I wouldn't bet on that, BTC is constantly improving and already the lightning-update will be a big step further. Of course BTC might be the prototyp for some currencies that are out there in 5-10years but yet it is still THE Cryptocurrency and I'm absolutely sure that this wont change during the midterm.

Lightning can't happen soon enough IMO.

if they manage to apply it in the next half year I would bet there is not much to worry about, but we will see. Please dont mix me up with a huge BTC fanboy, I know it has its flaws at the moment but the brand is just so huge and if ppl know about one crypto then it is BTC and it takes a lot of time for the public to undergo a certain shift

Good point with the updates- that will prolong its longevity for sure.
As far as the midterm- you’re probably right about that too.
Unless more countries start to make it illegal or an impossibility to own. Hopefully that won’t be the case but I feel like the ability to do what we’re all doing won’t last forever in the United States- it’s gonna become harder I’m sure ..and soon