Last time Bitcoin lost its dominance and slipped below 50% was last year or early this year that Ethereum got lots of bull run and if I remember correctly its market cap became half of Bitcoin....So everyone was talking whether Ethereum replaces bitcoin but it didn't take so long that Bitcoin skyrocketed and went above 50% again.

I believe we have a same scanario here for Bitcoin & Ethereum after this Ripple hype...Bitcoin and ETH now are volcanic eruptions in the making!