Most likely we are going to see manual testing phase out more and more in favor of test automation, with the main focus of manual testers shifting over to exploratory testing. There are enough problems within test automation however, that the approach to test automation has been changing as well - there simply aren't enough automation engineers at the moment to flat out replace manual testing. You can start to find test automation tools that don't require coding or technical knowledge, so you can ramp up really quickly.
This shift is still taking place though (you can see it starting in a lot of the big GSIs), so there is still time to learn automation. I would suggest getting certified with a scriptless test automation tool like Tricentis Tosca. They offer an online course that for Automation Specialist, Level One. If you send them an email at [email protected] and tell them Chelsea sent you, they can hook you up with the course for free. :)
Here are some other free resources from Tricentis that you might find interesting - they are directly related to your question.
Webinar: Test Automation for Manual Testers
Article: How the Future of Test Automation Affects You
*Full disclosure: I work with Tricentis. Hope it is still helpful for you though - making sure that manual testers have an awesome future as automation specialists is exactly what Tricentis has been working on for the past years.*
