Downsizing: in camera, ACR, or Photoshop

I'll start by quoting Jeff Schewe on a upsizing thread:
"In any event, I _DO_ agree that the whole sizing function in ACR needs a rev. I also agree thst upsampling in ACR is better than after the fact in PS because the sharpening and noise reduction can scale better when you set ACR to upsample. And I think it can be argued ACR upsampling is a bit better than PS's. So, I think that use case should be pushed..."
I was wondering about the opposite, and did not want to pollute the other thread.
With the advent of 36MPX cameras, if one knows that some images will end online, and their goal is not to be printed in a large size, or if storage space is an issue, should one use the cameras ability to record smaller images, downscale in ACR, or in Photoshop, for optimal quality? (I know that if it is not recorded, it is lost forever, while doing it in ACR/Ps keeps the raw file intact.)

Perhaps the answer has to be based on the individual's situation and projected use of the image data.
One could argue that you should shoot at the best possible quality and resolution, and save the raw file regardless of what your current known need for a photo is.  Some day you might happen to need a super high res version.  Of course, that happens in practice for some folks only very rarely. 
What's the size of a D800 NEF?  40 MB?  No lightweight for sure, but with today's drives of several million megabytes or more is it consequential?
The strategy I've found works best for me (and I have only a 10 MP camera) is to shoot in my camera's largest raw size, upsample during Camera Raw conversion (e.g., to 25 MP), then resize for use after the hijinks in Photoshop are completed using Bicubic resampling (the new Ps CS6 defaults are not good IMO). 
I can see my strategy being roughly the same with a camera with a lot more MP, except that I'd probably not upsample during conversion.
You need to outfit yourself with a decent computer for storing and working with very large datasets to be practical.  But such things, especially gargantuan storage, are cheaper and more powerful than ever today.
-Noel

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