I happened to attend a dinner where a panel of six numismatic experts pondered over this very issue, with an audience of nearly two hundred listening to their responses to six predetermined questions regarding the history and future of grading coins. Even without my numismatic experience I could see a very heavily weighted response toward sticking with the (albeit flawed) 70 point system when five of six panelists agreed it was better to stick to the old system, and only one audience member showed support for the 100 point system in a show of hands.
In short, if we do go to a 100 point system, it will be far down the road - we have many other issues to deal with first. Using today's technology to better handle the grading process, working on consistency issues across the board, etc. Changing the grading system at this stage of the game would be a mistake in my opinion.
Agree? Disagree? Why?