In the before times, the skills you needed to write were: writing the thing people want to read, pitching the thing to publishers, chasing invoices if you're not on staff, and optionally networking/schmoozing.
This still eliminated a number of good writers from making a living writing, but when you compare it to today, when you need social media expertise, community management, event planning, marketing, and speaking skills, and/or the skills to hire and manage people to do them...