It is no secret that $BTC has massively outperformed nearly every other coin this cycle.
Bitcoin Dominance has trended up for ~3 years but has recently started coming down rapidly.
The low timeframe structure on the $BTC .D chart is bearish and this means altcoins are outperforming BTC. Primarily $ETH leading the charge recently.
I think if we get a move to 48%-49% this cycle we should be very happy as that would already cause some insane moves on alts.
We'll just have to wait and see how this develops over time and go with what the trend is showing us.