Which altcoins have real potential to maybe take over Bitcoin's lead someday?
No coin will take Bitcoins place in next 5 or 10 years. And by saying take Bitcoins place is to be most used and usefull coin. Not that its marketcap will be higher or whatever. Coin that will take huge part of Bitcoin transactions will be Monero. Because of its private ledger technology.
It is possible that not the currency listed in that poll, but in some time a better Bitcoin (Super Extra Bitcoin
) may be created and may be a better solution. Then it is possible that he will take over the crown.