Is it smart to continue an approach when RVR drops below minimums?

[BeechBoy]

We've all heard this scenario a thousand times (by the way, this is for Part 121 operators). You're on an ILS with a visibility minimum of 2400 RVR. RVR is reporting 2400 until after you intercept the glideslope. While you're on your trip down the glideslope RVR drops to 1000. What do you do?

The standard answer is that you can continue the approach since you had legal weather at the FAF. This is true but can you (or should you) land? What if you get down to minimums, see the threshold lights and land? What if there's a friendly FAA representative there who later evaluates the RVR trend and determines that RVR was below 2400 immediately before and after your landing?

The point I'm making is that if RVR drops below minimums during the later stages of an approach you're better off going missed. While it's true that you're allowed to "take a look" if RVR drops below minimums after the FAF it's equally true that there is now a means of determining if you were, in fact, legal when the wheels hit the pavement. The old argument that "my flight visibility was above minimums when I landed" flies out the window when the visibility minimums are defined by a specific RVR value. Comments?