Because of the increasing regulation and an obscure overcomplicated taxation system, crypto coins will never exists as an easy-to-use payment ...
You don't see "increasing regulation" in the legacy financial system coupled with an "obscure overcomplicated taxation system" as an impetus for bitcoin adoption?
No.
I don't call it adoption if avarge Joe avoids crypto because he would have to do verification marathons before selling or buying crypto.
I don't call it adoption if avarge Joe avoids crypto because it requires a pile of paper for buying a coffee at Starbucks with crypto.
For the minor part of the population, cyber criminals, this is probably just a solvable problem because they doesn't have to bother with the compliciated taxation system anyway. They only have to find a way to buy or sell anonymously.
Because of the increasing regulation and an obscure overcomplicated taxation system, crypto coins will never exists as an easy-to-use payment like PayPal, Credit Card or some future Apple or Amazon payment method. If the avarge Joe choices to invest in cryptos anyway, he has the choice between weeks long verification marathons OR travelling a long distance for a meeting with a shady person.
Due to lack of usability for legal purposes (see above), crooks will increasyly involve cryptos in illegal activities and because of increasing illegal activity, govs will tighten the restrictment until the solely posession of crypto is threatened with a fine or even jail.
Trusted computing, internet censorship and elimination of cash will accelrate the process of thinning out the blockchain nodes connectivity.
Coinbase already has a fairly easy payment system.
...
And internet censorship would only hasten the
flock to distributed systems.
Still ... yes. I don't think this "easy buy easy sell on Coinbase" will last long, not even 10 years.
As long as the internet censorship is "only" filtering for traffic and ports, cryptos could survive certainly.
But if the world wide censorshop really manages to go that far in allowing only connections to pre-defined nodes which requires a valid license and a mandatory certificate (no P2P traffic between arbitrary IPs anymore) combined with a mandatory trusted computing secured device to connect to the "internet", then I could imagine that all cryptos really disappear.