Sure, Bitcoin can go up 100% from here but altcoins can go up 1000% much easier and much faster, given their current marketcaps and lack of liquidity. But do not wait for too long, buy at least a small amount of altcoins at current very low prices and smile later when majority suddenly (re)discovers altcoins, many of which outperform Bitcoin is all technical aspects. Pretty much every noob investor and speculator is dumping altcoins now so you should be slowly buying them.
If bitcoin fails, every altcoin will fail. It does not matter if some altocoins have better technology or not.
For any altcoin to succeed, bitcoin must be well. And only altcoins that provide something that bitcoin does not, can be alongside bitcoin. Whether these are faster confirmation (e.g. litecoin), anonymity (e.g. monero) or using computer power for science (e.g. gridcoin), etc.