There will always be smart technical people who do not like to code. There will always be ways of taking advantage of their talents.
I'm a coder. And I love my manual tester. She see's the world differently than I do and that's exactly what I need. What I hate are manual test scripts that pile up without any automation behind them.
The solution isn't to make sure everyone is a coder. It's to pair manual testing with automation developers.
Testing is a skill. One I value because it lets me go fast yet go safe. The problem is if manual test scripts pile up to where it takes 6 months to release a new version of our product we're all going to be unemployed.
A manual tester should be able to sit down with the product and abuse it the same way the user will. They should have the best tools. They should document how they caused any problem the best way they can. They should reproduce the problem for an automation developer who should create an automated version of this test.
That automated test should be fast. It should be run against subsequent releases but it should be removed if the subject of it's test is removed.
If all you do as a tester is run through prewritten test scripts you are being abused. If you can sit down in front of new GUI and uncover problems us code monkeys failed to think of you're a God send. Please keep it up.