I believe in altcoin ethereum, ripple, litecoin and monero because this altcoin is reliable and I am sure it has a very good prospect that so many people are investing here, and I am sure this altcoin can last for 5 years.
Yes I really believe that altcoin can last even 20 years or even last forever because most of the profitable altcoins are trusted and supported by so many people world wide due to its great help to so many people in terms of financial stability.