It's only a cludge for the last gasps of the mk7 anyway.... The mk8 almost certainly won't need the same cludge.
It's all about risk vs cost and its limited exposure.
You think it's only a cludge for run out MK7s? That seems a bit short sighted as the same engine is used in plenty of other VAG models which are nowhere near the end of their lifecycle (and i'd have to assume that they're losing MPI too) - the Polo is only a year old and the Polo GTI uses a detuned version of the same engine. I doubt this is a Golf GTI only loss of the MPI for purely DI.
Either way, should they really be aiming to bugger up the long term reliability of even just a year's worth of Golf GTI and R output.
They've just created a new engine code for the evolution of the engine that's now lost MPI - would they create a new engine variant for just a year's exclusive use on performance Golfs? How sure are you that they won't use this new variant in the MK8 Golf?
I suppose we won't know for sure until someone inspects a non-Golf that's WLTP approved which uses the same engine (Polo GTI, perhaps a Passat or Arteon variant).
It would be handy to see if all of the petrol engines are losing MPI (assuming they had it in the first place) post WLTP such as all of the 3-cyl 1.0TSI, 1.5TSI EVO, anything bigger than 2.0. If they are, i'd hopeVW have an alternative solution in place.