It will, But not now. Because altcoins tends to follow Bitcoin. If you look closely, When BTC dips so as alts. That's why it's important to know that alts can't go to the moon if BTC is ahead of them.
You are right it will happen later or sooner, but it seems it will take really huge time to happen that. That is why altcoins depend on the BTC, more than that BTC doesn't want to increase right now. Maybe when we see the movement of BTC, we can say that altcoins season is near to us. However, it is just away from us.