The market for browsers is roughly 50-50 today. Is this a stable equilibrium? How many browsers will survive in the market in the next 5 or so years? One? Two? Many? Why?

• 浏览器市场佔有率状态现在大约是50比50，这个状态会稳定平衡下去吗？五年之后市场上有几个浏览器能存活下来呢？一个、两个，或是很多个？为什麽？