Loki's death is one of the more shocking deaths in Infinity War since it happens pretty much right away, and fans are still not over it, to be quite freakin' honest. But is Loki really dead? This is the God of Mischief we're talking about here! He's technically "come back from the dead" twice now, so there's no reason he won't do it a third time (other than that crushed windpipe, of course) (Too soon?). We know, Thanos specifically said, "No resurrections this time," too, but what does Thanos know anyway? This is Loki Odinson, Prince of Asgard and Rightful Ruler of Jotunheim. Never count him out.
In fact, a Reddit theory by user l571b854 proposes that he might even be manipulating Thanos into collecting all the Infinity Stones so he can then steal the gauntlet for himself and wield its power. Whether that theory proves right or wrong, we're still fairly sure the Trickster God will be showing up in Avengers 4, one way or another.