It's been shown possible, so: 1. There's a number of well funded agencies which would be happy to abuse it. They have both the skills and time to do it. 2. Show

It's been shown possible, so: 1. There's a number of well funded agencies which would be happy to abuse it. They have both the skills and time to do it. 2. Showing that Spectre is possible on Intel created a steady stream of similar attacks. Other groups are likely already looking into it and may come up with much more feasible options.