In this analysis I want to make an educated guess on when the next bull-market (read: altseason) will start using the Bitcoin Dominance (BTC.D) chart.
An uptrend in Bitcoin with a falling dominance would be the ideal case for alts.
As seen on the chart, the altseason previously started by a top in the BTC.D and a consecutive fall afterwards. My best guess would be that BTC.D will continue to rise until it hits the top diagonal resistance.
In other words, Bitcoin will likely outperform alts for the time being. Later, likely after the halving, alts will start outperforming Bitcoin for 6-12 months and lead to huge returns.