'Doubtful it would ever be made, and no, I wouldn't buy it. Not only do many people find the grip of the full size Glock pistols to be too large, the length of the 50AE cartridge would cause the front to back dimensions of the grip of the pistol in which it was designed to utilize it to be
even greater than what is currently required to house the shorter 10mm cartridge in a G20 frame...
Between my single stack DE Mark VII pistol chambered in .41(/.44) mag and my Mark XIX chambered in .44mag, the XIX model can easily be converted to .50AE with just a barrel and magazine change, with either frame adequately sized to allow the insertion and use of a .50AE magazine. The DE's are of coarse large and heavy pistols which utilize a fixed barrel, which equates to extreme accuracy, along with a gas operated rotating bolt, which makes for a surprizingly light recoil experience when compared to these calibers being fired out of a revolver.
I think it would be totally illogical for Glock to conceive and bring to market a pistol model chambered in .50AE using their current barrel locking and recoil assembly technology housed in their typical polymer frame. It's my belief that doing so would require a totally different operating arrangement, far removed from their current design, and I really doubt that a company who's latest earth shattering upgrades consist of front slide serrations, metal sights, and an extended slide stop lever would undertake the changes required to accommodate the not very widely used .50AE cartridge...