Since (on an appropriate scale) metric aircraft use milimetres to measure length, mililitres to measure volume, miliamps to measure current, milivolts in the electronics, miliTeslas in magnetic fields, and above all pressure in bars it seems a completely retrograde step to suddenly divert from this logical and self-evident progression to abandon milibars in favour of the (to most) largely meaningless hectopascal, be it an SI unit or not.
To me, progress that ain't.