Alts season may start from October once BTC break 70k then alts will pump harder then we think. It's just a matter of time.
Personally I'm focusing on Eth/BTC pair which is give us signal of alts season.
It is important to note that altcoins season has a long way to go in my opinion. Though many people believe that altcoins reasons is expected to start this year, but i have been explaining that altcoins may not commence a bullish uptrend movements especially if the Bitcoin dominance rate is still moving up.
As at today, dominance index is at 56.3%, a situation that may not trigger the altcoins season; and for altcoins to have a full bull run, dominance rate has go lower from 56.3% to at least, 48% to 46%.
You are absolutely right, Altcoin bull run occurs when money starts shifting from bitcoin to Altcoins, this can happen in two ways.
1. Most begin to sell bitcoin to buy Altcoins, this reduced the price of bitcoin, as well as it's dominance, but causes the price of Altcoins to grow.
2. Investors shift their sentiments and money from bitcoin to altcoins, this means, instead of buying bitcoin, investors are now buying Altcoins, what this means is that, the price of bitcoin becomes more stable, it's market dominance begins to reduce, while the price of Altcoins explodes.
The latter is always the best and most effective in terms of Altcoin bull run, and this i believe is what most of us here are waiting for.