The great thing about collage is that everyone sticks together.
I can't really justify it, but what I want is pretty close, in the form of 1080p LED short-throw projectors; right now Philips and LG both have models out, though reviews favor the LG by a long shot.
LED: long projector life, and brightness figures that are getting better with each year's new models.
Short-throw: less clutter in my living room or wherever; I've got a projector (720p) from LG which I rather like, but the throw it requires makes set-up rather annoying. I suppose I could bother with a perma-install, sure, but I like being able to move it around.
Projector: vs. conventional TV -- easy to move within the house, or bring it while traveling, or secure / hide against theft
I'd also like to be able to get two of them, turn them on their sides, and make an even bigger picture; I've seen multi-projector set-ups that worked surprisingly well, but the set-up was finicky, and pretty much requires a dedicated viewing room. If this was a simple endeavor (to the user!), something like making a panorama shot on a modern phone, it would be great -- just put up all the projectors available, and let some algorithms work out how to use them all to make a high-as-practical total output
Philosophy: A route of many roads leading from nowhere to nothing. -- Ambrose Bierce