What the government probably _should_ do is begin establishing a record of manufacturers/vendors which indicates how secure their products have been over a long period of time with an indication of how secure and consumer-friendly their products should be considered in the future. This would take the form of something like the existing travel advisories Homeland Security provides.
Should you go to the Bahamas? Well, there's a level 2 travel advisory stating that jet ski operators there get kinda rapey sometimes.
Should you buy Cisco products? Well, they have a track record of deciding to EOL stuff instead of fixing it when it's expensive or inconvenient to do the right thing.
Should you buy Lenovo products? Well, they're built in a country that regularly tries and succeeds in hacking our infrastructure and has a history of including rootkits in their laptops.