If you decide to replace it, I would suggest going for an LED backlit type as Eric mentioned. The LEDs these use typically have a 50,000Hrs life, where if you tried using an incandescent (non eco) bulb this long, you would likely have replaced the bulb 50 times. These monitors cost more, but they typically have better contrast ratio, colour reproduction than fluorescent backlit monitors, as well as maintaining their brightness and colour white balance better over their life.
You can calibrate that display using a monitor calibrator (typically costs ~$100), but the catch is that they reduce the stronger primary colours to compensate for the weaker colours to achieve the correct white balance/gamma, which will usually result in an even dimmer image.
On the other hand, a monitor calibrator will be useful if you need accurate white balance and gamma. Note that they do not improve the range of colours the display can reproduce, so calibrating a low cost consumer monitor will not make it achieve the colour reproduction capability of a higher end monitor.