[Bobby Mosca] “Okay, so here’s what I’m hearing:
I can keep using DVDSP on Lion if it’s already installed when I eventually upgrade the OS… probably. This has the ring of uncertainty and of course, it’s temporary.”
Clone your boot drive now with DVDSP on it. Even if Lion or some future OS won’t work with DVDSP, all you have to do is boot off that drive and you can make your DVD.
Otherwise…you have to start looking at Bootcamp and PC alternatives, if you don’t want to use Encore.