Windows 10 going out of support is not going to cause the computers to stop working and become e-waste. Commonly used software (such as web browsers) will continue to support Windows 10 for a few more years; Windows itself may be less secure, but for basic usage and with a restrictive firewall, it should be fine.
If you’re concerned about lack of support for Windows 10 and want to switch to a supported OS, you’ll be better off using Linux.
Of course I know that computers don't stop working after just because Windows 10 went out of support. It's more of, for example, a severe vulnerability is discovered that has been fixed in later Windows versions but not 10 that may cause some people to panic. Maybe I'm being paranoid here, but I did raise some valid points, some of which coincidentally play into profit motives such as by encouraging the purchase of new hardware.