WG,
Be careful with your numbers; that quoted figure for P2 probably includes several years worth of support costs - it's unlikely to be just for design, parts and manufacture. P2 will be a superb airframe, and will outperform the Merlin in most areas and give the CH47 a run for its money in others.
I think history won't be kind to the acquisition and running costs v capability arguement for Wildcat, Me 2 and, particularly, Me 4....
OSD 2025? Highly unlikely IMHO (unless AW are going bust again)....