"there is no reason the PNF cant check both ASI's and the STBY to make sure they are both reading the same value prior to the 80kt call"
This might be a problem on the newer glass cockpit aircraft with LCD displays, where the angle of view may not provide the PNF a clear view of all the instruments.
I'm also thinking that the "window" to check all three indicators may be limited if the displays don't start moving until 35 or in some cases 45 kts. As an example, the captain of a 747-400, in a recent incident, didn't notice his airspeed indicator was completely U/S until the F/O called 80kts (An engineer had not hooked up the pitot/static plumbing to the Left Air Data Computer). The takeoff was safely aborted before the aircraft reached much higher speeds.
The very latest 747-400's use a single tiny standby instrument which the average person might find difficult to read, let alone fly an aircraft with.
I'm sure aborting on the ground at low speeds would be far safer than only having one pilot who can see only some of the instruments.... and having a half-serviceable aircraft where any number of systems may be degraded as a result of the faulty airspeed data (Engines, FMC, Stall warning, Flap Load Relief, Aileron Lockout, Autopilot, etc).
Where there's smoke, there may be fire. Who's to say that the F/O's ADC plumbing might suddenly come adrift also?
Hope this helps.
Regards.
Q.
P.S. Don't forget the accident where the pilot-statics had been taped over on a 757(?) and the pilots didn't have a clue how fast or how high they were flying, resulting in the deaths of all those on board.