The gnomes are one of two people of modern Azeroth who can lay claim to being the most intelligent, most adept with technology, most innovative of the mortal races. Unlike their goblin rivals, however, the gnomes are not materialists in the sense of always seeking a means to profit - their mindset is far more exploratory. A goblin looks at a situation and bends her mind to determine how best to exploit it, while a gnome seeks to learn how it works. And in a way, the gnome is far more dangerous, because they're never satisfied.
Consider this - the gnomes invented a weapon so destructive it rendered their own city unlivable for years. Even today, Gnomeregan isn't fully recovered. This radiation bomb (the work of Sicco Thermaplugg, the ambitious madman who once ruled Gnomeregan in its fallen state after Gelbin Mekkatorque led those gnomes he could out of the city) is proof positive of just how terrifying gnomish ingenuity can really be. Unlike the mana bomb Garrosh Hellscream used on Theramore, the radiation bomb doesn't destroy building - it kills without ruining structures. Furthermore, the mana bomb was a discovery, created by blood elves serving Kael'thas Sunstrider who had the chance to study naaru technology in Tempest Keep, but the radiation bomb was entirely a gnomish invention. From their origins as a titan created construct race, the gnomes have persevered through to the modern day as a clever, resourceful, inventive people. But Sicco Thermaplugg also shows that gnomes can be treacherous, deceitful, arrogant and even contemptuous of others.
Now, following the Siege of Orgrimmar, is there any limit to what the gnomes can achieve?