SUGGESTION TO WGT:
As the 'Average Score' is evolving further and further from this, why not avoid all this confusion and simply change it's name to 'Player Rating'.
I think the changes are a good thing, eliminate sandbagging and provide a reasonable indication of a players potential, i.e. what they can hope to score on a good day. It's actually a good step towards a handicap system that alot of people have been suggesting. Won't stop quitters as there will always be people who can't be bothered to complete a bad round but will at least stop this being done to effect average score (although with level system there really seems no point to this other than ego).
Also, in terms of MPC sandbagging, as a quick hit can WGT not show MPC record as well as ave. score on player selection page? An amateur with a winning record against higher tiers would soon stand out as a MPC cowboy.
Longer term, why not introduce an MPC rating system? As an outline, if player A has 12.0 and player B has 10.0 this would indicate a 'par' result would mean player A wins by 2 holes. If this is the result ratings remain unchanged, any deviation and rating would be adjusted up/down accordingly (similar to ICC world cricket rating approach). Fairly embryonic idea but thought I'd float it, although I'm sure it's not a new idea.