I know many will say the time ended, we must have bought before 15 days but I think this is the best time. Before couple of weeks ago, BTC was around $4k and which is why altcoins are overpriced in term of BTC. Now that BTC has gained price, altcoins price has decreased in term of BTC and now is the best time to pick your favorite altcoin because right after the BTC ride, altcoin will also follow the trend.
Yes, it could be a good time for altcoin right now. There are many speculations about bull run in 2019 and it seems like most of altcoins will go along the flow of the market. I want also to store some pieces of altcoins and leave them on my wallet until the end of December. It might be unpredictable today but it could be possible for the next few years.