will there ever be a second Bitcoin?
"Second bitcoin" is kind of paradox, don't you think? It should automatically be a shitcoin too.
What we need (and is possible to exist) is innovation. Something new. Something fresh. With ideas that can address all shortcomings in Bitcoin and bring something new to the table.
For example I always found Directed Acyclic Graph (DAG) coins innovative and interesting (coins like IOTA, Nano, and Obyte) but they never got to anything interesting enough to be able to solve any issues. And these projects all have certain flaws including centralization and premine. But at least, they are different and innovative without repeating the same thing trying to create "second bitcoins"; and that's what we need.