A speaker that is idling (i.e. the amplifier is powered, but there is no signal across the speaker) is no more likely to fail than a disconnected speaker. At a guess, if you integrated the cone excursion over time, that would be proportional to how long it would last.
2500 hours is probably more than the life of the electrolytic capacitors in the amplifiers. My guess is that the product would be obsolete first, its amplifier would fail next, and the loudspeaker itself, if kept dry, and away from pets and small children armed with sharp objects, would outlast both the amplifier and the product's useful life.
After all, there is a good market on Ebay for products like this, https://ebay.us/1aOrZF which worked hard in their early life for 3 decades in cinemas, and then became collectors' items and are still going after 60 years.
Anyone with any concerns for the environment should be using 1960's stereos - not only does it reduce waste, but loudspeakers of that era were at least an order of magnitude more efficient than it is these days. (though if you're still using valve amplifiers, that might not be entirely true)
2500 hours is probably more than the life of the electrolytic capacitors in the amplifiers. My guess is that the product would be obsolete first, its amplifier would fail next, and the loudspeaker itself, if kept dry, and away from pets and small children armed with sharp objects, would outlast both the amplifier and the product's useful life.
After all, there is a good market on Ebay for products like this, https://ebay.us/1aOrZF which worked hard in their early life for 3 decades in cinemas, and then became collectors' items and are still going after 60 years.
Anyone with any concerns for the environment should be using 1960's stereos - not only does it reduce waste, but loudspeakers of that era were at least an order of magnitude more efficient than it is these days. (though if you're still using valve amplifiers, that might not be entirely true)