Saeviomagy
Adventurer
Seriously? You think they intended that a single racial feat give the equivalent of like, six different superior weapon proficiencies for weapons that hadn't even been designed yet? Give me a break.
Would you ever take six different superior weapon proficiencies on a character?
Hell, would you take 2?
Unless you've got some specific concept, the answer is no. Having access to all superior spears is mechanically the exact same thing as having access to one superior spear. And I can't believe that the designers wouldn't have contemplated the possibility that there might be a superior spear at some point in the future.
And the reason they don't have a feat that does it? You can always just retrain to whichever specific superior weapon you happen to be using at the moment.