In PvP specifically, downed skills can be very punishing to glassier builds (not what I run, to be honest, but it's a fact).
Should downed bodies be able to dazes and stuns? Necromancer's downed 1 ability especially hits for half your HP (exaggerating) when you're a glass cannon or a bruiser/roamer.
It would make, though, for less interactive playstyles when you are downed, because you wouldn't be able to do much (which you are alrady not able to do if left to bleed out).
Cast your votes!