While 50GB on one disc seemed pretty incredible just a few short years ago, some enterprising scienticians are set to make your dual-layer copy of Click look downright quaint. A new version the Blu-Ray disc called BDXL (get it!?) is on the way and promises 128GB of storage space for writable discs. The new tech, which uses three or four layers instead of one or two, is aimed mainly at corporate users looking for a robust backup solution and lonely geeks with terrabytes of smutty films. Okay fine, only one of things is true. Before you get too excited about having all three Lord of the Rings movies on one…