I thought that repeatedly writing to flash memory ruins it. Has something changed? As far as using memory for other things, you can cache everything out the ying-yang if you have enough of it available. Mainframes have been using LRU algorithms for years, as well as cacheing at the disk controller level, OS level, and application level. People might consider what MS is doing is cool, but it's certainly not new.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma