...
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. Huge now, but it doesn't own the sourcecode/Bitcoin protocol. Just like other service providers started using TCP/IP, other coins can use the Bitcoin protocol.