Yes. This is exactly an idea I've mentioned here before. In fact, I've planned to write up more in depth reasoning for it. I PMed Gavin a while ago with the thought (he didn't comment back).

I do think we'll ultimately see Bitcoin scale relying primarily on technologies like the Lightning Network. However, I don't think there will be any single silver bullet solution. Instead, we're likely to see a mixture, and using more than one blockchain I feel is likely to play a part. As I said I plan to write more extensively at some point.