There are even problems with the existing classification systems. In my opinion, neither the IDPA nor USPSA classifiers really test much other than your ability to shoot classifiers, since they tend to test skills in the wrong proportion to their importance to match performance. For instance, the IDPA classifier has fully one-third of the shots fired at 15-20 yards, yet you could shoot a half-dozen IDPA matches and never see a shot at that distance. Almost all the USPSA classifiers are shot from one position, at close range; nothing like the variety you see in matches.
The one test that has (sort of) stood the test of time is the El Presidente, essentially the granddaddy of all classifiers. Thirty-five years ago, seven seconds on the El Prez was considered "par", and if you could do it in six, you were something to behold. The El Prez has changed a bit, with the targets three feet apart, rather than three yards apart, but today, nobody really takes notice until you get close to five seconds, and the top shooters can do it in four.