Don't worry about overly grabby strangers stealing your data just yet. The technique primarily focuses on GnuPG's encryption software, which already has a patch to limit the effects. Thieves also have to monitor the electricity while decryption is taking place, so they can't just grab info on demand. However, the very nature of the technique makes it difficult to stop completely -- unless you're a fan of insulation and Faraday cages, someone with physical access to your system may always have an opportunity to peek into your most sensitive content.