Commercial airlines are already required by law to do a certain percentage of their landings automatically. They just don't tell you...
what you mean is that pilots must remain proficient in Cat 3 and 3a approaches - so they must maintain currency with those procedures by performing one every once in a while. This currency can also be accomplished in a simulator.
Cat 3 and 3a autoland has been around for a long time. (1965)
http://en.wikipedia.org/wiki/Autoland
Trying to do one of these without a co-pilot is ill-advised (1 set eyes on instruments another looking out for the runway environment) - don't forget about radio calls, communication with home base / fuel management / emergencies / etc.
I flew very complex, very large planes - and I can tell you that there is a real good reason for at least two in the cockpit.
j
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