Who really cares this has been done to death..
We all know BB turbo's offer a longer life and better response/spool than journal bearing turbo's; its up to the individual if they wish to replace a turbo at 100,000km's or 40,000km's while putting up with a little less response. All though I don't believe for one second a well built 360degree journal bearing turbo is that bad, hell even stock VLT turbo's see in to the 300's if treated correctly.
Do remember there is much more to a responsive turbo than its bearing system.
Back to hotshut downs... there really is no proof, I've seen one R34 GTT turbo with stuffed bearings caused by a supposive hot shut down and thats a BB turbo, personally I doubt a single or even a few hot shut downs will stuff a turbo, the only way I see possible is if it was starved of oil when spinning 100,000rpm, which may be possible in a hot shut down situation.. who knows.. I sure as hell dont.