First - bitcoin works on Blockchain, which I'm sure is our future almost in every sphere, it gives almost unlimited possibilities. Second - BTC helps us to get rid of banking services, unnecessary official red tape, and it allows you to manage your own funds. And the last one is simple - you can make good money on it)

I suppose it's never too late. Now is very good price for buying. Some are saying that it's the end of btc, I know it's not. It looks more like some sort of trend, and we need to seize the opportunity.

There is no simple answer, especially, when we talk about cryptocurrency. The first thing, you might should do is to learn about the currency, what affects it, what are its advantages and disadvantages, etc. Don't listen to anyone, so there would be no one to blame on. Take your own responsibility, and turn on your analytical skills. And maybe, just to start, invest only that amount, which you are not afraid to loose.

It might not replace gold in it common sense, but I believe that in this fourth industrial revolution in can be valued on a par with gold

Absolutely agree. Any eth or xrp can't fully replace it.