Are the Grand Tours Too Much?

We are in the Spring Classics season, with Paris-Nice, Milan-San Remo and others. Paris-Roubaix, the Queen of the Classics, was yesterday. So, the 2015 pro cycling season is off and running. One question that keeps popping up is whether the Grand Tours, the Giro d'Italia, the Tour de France and the Vuelta a Espana are too long and arduous for a pro cyclist to complete and win all three in one season. The Union Cycliste Internationale (UCI), the world governing body for cycling wants to reduce the Grand Tours to two weeks. This would allow top tier General Classification (GC) cyclists to compete in all three and perhaps generate more fan interest in cycling. Currently, most top tier GC cyclists focus on one or two Grand Tours at most. I've ridden 27 days in a row once as a part of Bicycling Magazine's 2012 Tour de France challenge to ride every day of the tour. I rode every day and more. After 1 week, my legs were sore. By the third week, my legs were numb.