there are better technologies than btc but up until now, no one can beat the popularity of btc. if you've been in this forum long enough, you've seen a lot of projects offering much better performance than btc. however, most of them are dead already.
though there are indeed better projects out there, the question is, how are they going to cope up with BTC's popularity of usage? though we have several top alts to offer the shortcomings of btc, still people go back to btc because it is the trusted one in this market.
When we talk about better technologies we should muse upon better for what? If a helicopter will get an additional option of vacuum cleaning of a house it will hardly make it more popular even if it becomes better in some sense. Advantages of some known altcoins are not making their better than bitcoin in main thing: they don't increase the level on trust and don't make them more well known. To become separate from bitcoin an altcoin need to have some useful option which can't be made with bitcoin and to make it known and trusted regardless to bitcoin. Not to be better but to be substantive.