I was thinking of a scenario. A lil long.
Ok, so Mark Karpeles had nothing bad happen to him for goxxing everyone, right.
That depends on what you mean by "nothing bad happen", but generally most people who lost bitcoins at MtGox would agree that justice has not yet been served.
So if nothing happened to him, what stops the few BTC devs from working with the top 1 or 2 mining "guilds" and forcing a change onto the miners?
Nothing at all. Lots of developers have already done that. We generally call them "altcoins".
Like 10 people can get together and do whatever they want with 21 million BTC?
No, they cannot. They can get together and create their own altcoin. Then they have to convince everyone to switch to their altcoin.
If the devs went to someone who had control over 50.0000000001% of all mining power, and they convinced them to accept any changes, then there could be infinite BTC correct?
Incorrect. There could be infinite of whatever they wanted to call their altcoin.
I am asking this seriously and I am not trolling.
Then you clearly don't understand how the bitcoin protocol works, and why distributed consensus is such a significant development.
Can the number of actual total possible BTC get increased or decreased?
That really depends on how you define BTC, but generally, no.
What is stopping anything from having an increased block reward
Me. And everyone else that is running a full node or mining.
if it is all open source right?
Because it is open source, if anyone tried to change the protocol, everyone else would learn about it. They could all then refuse to upgrade to the new software.
But a few years from now the only major players will hold an oligopoly over BTC
This is quite unlikely, and you haven't given any reason to believe it would happen.
and everything will be too expensive to buy your own for the smaller people.
Then exchange smaller fractions of a bitcoin.
So BTC will turn into something more centralized than the current banking system in the U.S.... In the U.S. anyone can make a bank and yeah its dominated by like the top 20 banks or so? But there is a lot of moving/working parts to make it happen. A big change can easily be ignored by the majority, but in BTCs case a big change just needs someone like Cex.io to say Yes and the change gets pushed through.
You appear not to understand how the current banking system works or how bitcoins works.
Instead, you've invented some imaginary way that you think it might work, and then managed to become afraid of your own imagination.EDIT: On re-reading what I wrote, I see that the sentence above was uncalled for and a bit judgmental. I apologize to everyone for inappropriate condescension.
That is how I understand what BTC is going to turn into.
Then perhaps some additional education is in order.