What a stupid recommendation. Generally people have much more than 1500hrs before they have the requirements of an ATPL - especially if they have lots of semi-relevant turbine copilot time. i.e. the real requirement for some pilots is now 2500hrs TT (or alternatively 1500hrs in less relevant single pilot ops).
And all this based on a round table discussion of opinions - no emperical data whatsoever was presented for this position. It's like the sharemarket - lets just follow the USA.
I doubt that CASA will wholly follow through such a simplistic and poorly thought through recommendation.