bitcoin has many technological limitations(1MB size of block, takes long time to process your transaction) and so had been hardforked to bch, btg.
it could only be used as currency since they do not support platform like ethereum does.
currently many icos are based on ethereums, cause they support tokens on their platform.
I think the only benefit of using bitcoin is that it is the very first cryptocurrency and altcoins are exchangeable in exchange because of btc's stability.
how do you think of bitcoin? will it still have much advantages&value as it now has?
Bitcoin is always a bitcoin, meaning it has more advantages than other cryptocurrencies, though we cannot tell for the near future, but for now as we can see, Bitcoin is still the leading cryptocurrency one reason is that it is the first crypto ever made. Also, it has the tested track record to secure hundreds of billions of dollars without getting it vanished to stealing or any accident, or in other words it doesnt have bad image regarding security.