You're kidding right? Or do you have free power? With the reward halving - I am shutting down. Use the bitcoin profitability calculator and see if you are actually making money after Wednesday with 25 BTC:
http://bitcoinx.com/profit/
Yeah, unless more than half the people shut down then you won't be making more profit. If you're counting on people dropping out and there being a big difficulty drop, don't. Difficulty drops take forever to hit compared to how quickly difficulty can ramp up. You normally get difficulty adjustments about every 2 weeks, if half the people shut down, difficulty will still be the same until the next reset, but since half as many people are hashing, it'll take twice as long to get there.
We just adjusted to 3.43 Million difficulty about a day or so ago with a network hashing rate of ~ 24-25 TH. If nothing changes we'll see the next adjustment around 12/10. When the reward drops we'll still have 1680 blocks left to find before the difficulty drop. If the network suddenly drops to 12-13 TH, it'll probably take double the time it normally would to find those 1680, or 20 minutes a block. Calculate that out and we're talking 23.3 days from that point to finish those remaining blocks or somewhere around 12/21 or 12/22. That whole time you will be getting half as much per block, and the blocks are going to be longer in coming.