Many exchanges said that they will support and implement segwit2x somewhere in 2018. This will produce another altcoin (like Bcash, Bitcoin Gold, etc) and making the current Bitcoin legacy or it's just an upgrade to the blockchain? If it makes another altcoin, then why Bcash was created? I don't get it.

Is this some type of hard fork like was for ethereum? Etherum did became legacy: Etherum Classic and the new hard fork, simple, Etherum. As I can see people adopted the new coin which hard forked: Etherum. Is this will be the future of bitcoin? What is your thoughts?

If the "new" segwit2x will be adopted and marking Bitcoin as legacy, then will it follow the same path as Etherum classic? I am asking because the Etherum Classic is ~$35 while Etherum is $700.

Is it worth to invest for long term (1 year) in Bitcoin for 2018 - 2019 if the segwit2x hits in?