Excellent explanation azguard! Thank you!

With the fork creating a new bitcoin in Bitcoin Gold, it doesnt actually do anything to BTC. My question is thus - can BTC be improved without a fork? Will it ever be able to increase processing bandwidth or transaction size without completely changing the code and creating a new coin, is this what SegWit2x is supposed to do? Or is BTC maxed out now in regards to speed and transaction size?