u are right,but right now games released there is little time to psx (or dreamcast) are being used illegally anyway,if Sony or Sega want to sue emu authors they could do it right now,even because i bet Icarus author doenst expect that after his emu is released (if it will be released one day) that only people who have the ways to dump the games of Dreamcast will use his emulator,even if dreamcast is completely dead.
Edit:and will take a long time before dreamcast games can be considered abandonware,am i right?I dont believe that someone will wait so much time for that.