Ethan Siegel is not the most popular writer on Scienceblogs.com but he may consistently be the most enlightening.    

He writers that the future of particle physics is commonly believed to be either going from the Large Hadron Collider to a Very Large Hadron Collider for protons, or going back to electrons and building a huge Linear Collider. 

There is another option, he says. What if we could find a particle that had the best of both worlds?