Most NVFR accident I read about are more decision making weaknesses or flight planning issues. If NVFR pilots are current and follow the guidelines and requirements of the rating strictly, I can't see why anything needs a changing.

Yes, but that was an IFR flight if I recall correctly! A colleague of mine survived that crash.

Ground them all, I say - that should improve the accident stats!

Spot on.
The recency requirements in the current legislation are more than adequate.
Look at the actual NVFR incidents. The regulations were not followed... Same as VFR into IFR... Component life exceeded... Duty hours exceeded ... Hours not entered on MR etc etc
You are kidding yourself if you think altering the law will make any difference IMO.