I think once GNOME and KDE bloat to one gig+ live-cds, LXDE will become the only choice for those without dvd burners or huge thumb drives...
Seeing how small LXDE-live is, and how easily the Security Spin was stacked on top of it (I'm guessing), I think LXDE-desktop could become a spin of remixes... A CLI retro terminator remix... A light, but GUI, LAMP+X+panel A live cd with OOo and GIMP full (no longer exist on one live cd) et c