the fees are high if you move a few tens of dollars, in proportion to a transaction of 20/30 $ you pay 10/15% of the value in fee. the important thing is to avoid making micropayments with Bitcoin, to make micropayments the altcoins are better
For micro payments I use LN. I don't see much point in using an altcoin that I can't spend anywhere just to save a few pennies. By using Bitcoin you pay for security and wide level acceptance at the same time.
Everyone in crypto will accept my Bitcoin payments. Way less will accept a top 10 altcoin, and orders of magnitude less people will accept payment in an altcoin with a sub $1 billion market cap.
When exchanges roll out support for LN things will become even worse for altcoins. I'm not saying they will become worthless, but certainly less in demand because they can't compete based on low fees anymore.