I think Bitcoin will remain king of the crypto wold for a long time.
Maybe there are coins with better features, but bitcoin was the first and bitcoin is the most widely known "brand"
For a lot of people new to the crypto market Cryptocurrency = Bitcoin.

I don't see this changing in the near future.

Next to the above... many alt coins only have a BTC trading pair. So if you want to obtain them, you have to buy/own bitcoin first.