As modern hardware advances, I see the chances of Sega releasing some of the Dreamcast library in digital format. They already do this with some games for PC (though I believe these were Windows CE releases for the Dreamcast already so they are not emulated but more compiled for regular Windows).
Fans have been able to get decent speed and compatibility out of homegrown emulators in the recent years too so there is hope the Dreamcast can live again.