Fluf like you suggest the real cost will emerge in coming years but really unless it becomes so huge that you get toward turbine cost it won't matter.
There are so many people that won't entertain light helicopters because the safety is referenced off the R22 - and rightly or wrongly that is seen as very negative.
None of these machines are especially cheap however and outside of the training establishments the private owner is likely to reach the limit of an R22 by way of time passed idle than time in use.
Outside of that the capability of the G2 is vastly superior to the R22 - I'd not like to be sat in an R22 in a stall turn for example.