They do last a lot longer, but they are just as hot, if not hotter, and still loose out on life span.
I would rather just invest in an AC, you could use it regardless.
Fact is there is no such thing as a true laser projector, what it does is they use a blue laser to excite a ring of phosphor to produce white light that is then run through a light engine like with any LCOS projector.
And even though we have had laser projector around for nearly five or so years now, pretty much only home cinema one I know would be the Epson LS 10500 for $8000, which is in reviews not on par with the JVC's for <4000 or barely outperforms the Epson EH-TW9300 for $3000.
Only real difference in this the laser source in the LS-10500, so that's $5000 for a light source that albeit should last a while, but still only rated for 30k hours on ECO.
And when that source goes, you throw the unit away.
No changing this.
(Ok there is a Dell DLP short throw laser for $5000, but I'm not sure about availability)
Now what I consider more interesting is LED's.
Hong Kong Beida Jade Bird Display (JBD) has prototypes for a 5500ppi LED panel that achieves over a million nits in brightness.
With this you could quite possible replace both the LCD panel and the light source with a single chip.
And like Oled, each pixel can go true black.
Still very early, but I am loosing more and more confidence in OLED that's for sure.