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What fundamental issues?
-difficult to use for non-techies
-obscenely high block reward (inflation rate)
-slow confirm time necessitating cludgy workarounds
-blockchain bloat
Just to name a few.
You are greatly underestimating the force of network effect and protocols.
TCP/IP is one thing that has yet to be replaced by a 2.0.
Bitcoin (the blockchain you're invested in) is not TCP/IP, it's more like America Online. It's huge now, but it doesn't own the sourcecode. Just like other service providers started using TCP/IP, other coins can use the Bitcoin protocol.
Doesn't take much foresight to imagine all those problems being solved in due time. You people sound like those who were saying the internet would never scale in 1992.