I doubt it.  Bitcoin is irreplaceable.  Ethereum might be the top altcoin and might reach bitcoin value but replace it is impossible.  When the time comes that ether will reach the bitcoin value now, the bitcoin value by then will be much greater than its value today.  Bitcoin build its name through a long period of time and history can explain why bitcoin is the currency of future.  On the other hand, ethereum is still building its reputation and proving his capacity on the crypto market.  I think ethereum will never surpass bitcoin.