I've had locusts. They're pretty good, especially panfried, but unfortunately people seem to be having trouble importing them into the US:

http://abclocal.go.com/kgo/story?section=news/local/san_fran...

I don't think they can ever completely replace beef or pork, but the article was pretty dead on when they described them as something crunchy that could be added to fried rice or whatever.