100% true that BTC is just enjoying the spotlight right now. Mainly because of the influx of institutional money coming in that is only familiar with Bitcoin... they are also probably being advised by their teams to only stock up on BTC because of the centralized nature of exchanges relying purely on BTC pairs for volumes.

The main goal of many traders is to accumulate MORE BTC, not so much alt-coins. Some traders only care about FIAT but the truly savvy ones know that Bitcoin is much more valuable to trade against.