I believe that the Alternate Cryptocurrencies season has already started but its not not about to end anytime soon because this shows a great amount of opportunity for people to earn a lot of Alternate Cryptocurrencies through campaigning for them and joining Airdrops. Its just that its shadowing a bigger Cryptocurrency which is Bitcoin but I believe there are many profitable Alternate Coins and you just have to find them carefully.
For me, the alternative season will begin after the price of altcoins rises in price relative to bitcoin. Currently, we see that the price of BTC is growing stronger than the price of altcoins against the dollar. This indicates that investor confidence in bitcoin is now higher than in altcoins.