i don't think that bitcoin supremacy will come back to 70% that would be a great fall for altcoins or a huge rise for btc and in this moment is not expected, btc will surely rise after the lightining network release
When will it be released? Many information about the lightning network but nobody know when?
I know it will be good and best event for bitcoin if lightning network being adopted soon.
Their is no certain here once lightning network all are into place. So many predictions about altcoins and btc may happen this year. But, making firm decisions whether you sell you altcoins or hold into your btc, so Im still holding btc and some altcouns would remain.