If the 60,000 hour figure is in regard to the phosphor life, then that means that at the 60,000 hour point, the phosphors in the display (for a constant electrical energy provided to them) put out half the light that they did when the display was brand new. This is an estimate on Panasonics part. Your Mileage May Vary. Beyond the "half life" point of the phosphors, the display is still useful. Just a little dimmer. Turn up the brightness a little to compensate.
The chance that something in the display will fail, rendering the display inoperative can be expressed as MTBF (mean time before failure: the point at which half of the study sample has failed and the other half has not) and hopefully is also in the tens of thousands of hours.
Of course this is affected by how high the brightness (and contrast) settings are. 60,000 hours is SEVERAL years of use. 30,000 hours is also many years of viewing, just half of 60,000. DUH!
Keeping the brightness and contrast turned down will extend the useful life.
I find, that for a 42 or 43 inch plasma display, EDTV is fine. HD costs a LOT more and while giving a more detailed picture, especially at a side-by-side comparison with EDTV, I can be happy with EDTV in a 42" size, especially for well under $2K.
Paul, the 1derful1