For the most part I actually skipped sass and went straight to SCSS/sass3. As I really didn't like less/sass2 etc.
It would be nice to see this develop and how it impacts the community. But overall pre-processors aren't going away any time soon and for me I'd need to see it become backwards compatibility (somehow). It's the biggest sticking point for me. Otherwise, as mentioned at the end of the presentation people will end up using both. So it's not so much pre-processors will die, but more that the way we use them will change.