What are the most feasible or related EA career options to consider for a person who has spent their career so far doing sales and business development, mostly for software products and services? 

Here are some ideas from the forum:

1. Lobby or get a policy degree ( brad_ea's comment and associated subcomments).
2. Grow the EA community of marketing and sales professionals (DavidNash's reply to ColinBested).
3. Do marketing or sales for alternative meat companies (awhitney responding to ColinBested).
4. [Your general suggestion here.]