This material is hardly exceptionally dangerous. Its close cousin Gallium Arsenide has been nearly the exclusive source of Yellow, Red, and Infrared LED's since the 70's. The screen you're looking at now would not exist without arsenide compounds, both for lights and for other circuit components.

While you could probably make yourself sick by taking old chips of this nature, grinding them up, and inhaling or eating them, or engaging in an accident with their raw materials during their manufacture, they rank pretty low on the list in terms of practical toxicity. Arsenic is a common trace element, and even (in small quantities) has been used to ward off disease in chicken and cattle.

It's not good for you, but this is a positive development, not a poisonous watershed.