i think many folks are been carried away by this current thrend by some people that " sooner or later" altcoins will BOOOM".
i don't think we will see any altcoin again with the recent flock of new altcoins in the markets. nothing is coming but investors should be careful in selecting good tokens and coins to invest in. surely, there are good altcoins out there BUT the Season, No way. we are not seeing any bull market for altcoins .
If there isn't boom at the moment, it doesn't mean that wont be in future. Also there is no guarantee that bitcoin will be major cryptocurrency every time. There are some really promising altcoins, for example Monero is great choice for those who want anonimity. Another great altcoin which was recently created is Grincoin, check more about it yourself.
Also there are a lot of factors too, if there will be created altcoin which will be better than bitcoin and will also be supported by a lot of services, then we may see a boom.
And on another hand, usually altcoins follow to bitcoin because it's major, still it doesn't mean altcoins won't rise without bitcoin's rise.