The filament thins because of evaporation of the tungsten. But the death of the bulb is almost always caused by breakage of the filament at hot- spots caused by uneven evaporation, in response to the turn-on surge. I had 4 bulbs blow simultaneously a few days ago- the voltage was probably high when I turned on, and I probably caught the mains at a peak. None of these bulbs had been in use for anything like 1000 hours.

I've just measured a standard European 60W bulb. Cold resistance is 72 ohms. The hot resistance is, by calculation, 240*240/60 = 960 ohms, so the startup current will be over 10 times the running current.

CF bulbs are fine where lights are on for continuous periods, but I suspect that much of the expected saving will be lost. Because of the pisspoor start-up performance people will leave them on continuously in situations where an incandescent bulb would have been turned off.