i do this question because i´ve read in this website issues with bitcoin, slow mining process, high fees, etc. and i´ve read too good reviews of some altcoins, ethereum (smart contracts), ripple (for transfers between banks), dash and nem. these altcoins called 2.0. could bitcoin become just in future virtual gold reserved to companies and rich people?
There is a possibility. However the probability of this ever happening is quite low.
In all of cryptocurrency's history, bitcoin has always been the number one crypto. Litecoin, Ethereum, Ripple have all come close but none have ever overtaken it. I believe that the reason this is the case even though you can see that Ethereum has more functionality, ripple is able to do interbank transactions and already have partners, and litecoin being cheaper in transaction fees and faster in blocks is that bitcoin has a reputation that no one else has.
All these altcoins are built on top of bitcoin's blockchain technology. Bitcoin was the first to implement it, it has a wider community etc. You barely can find one person that is involved in altcoins but not bitcoin. But you'll find lots that only believe in bitcoin, but not altcoins.