Speaking as an airport controller, and in spite of the amusing comments, if this system can reduce the risk of runway incursions then I'm all for it. But....
There are some well established systems for indicating that an aircraft can enter the runway but this new system uses something different. But I'm a Brit and I think that the system we use works well and is safe (and, as far as I know, meets ICAO SARPs).
More importantly, this system, like others designed to automatically monitor runway occupancy is likely to suffer difficulties in providing an alert when it's necessary and not when it isn't. A-SMGCS systems have been under development for years to do just this - they're getting better but they are not by any means foolproof, but at least they only provide an alert to ATC who can make a reasoned decision about whether it is 'real'. If these false alerts are visible to all and are not filtered out by the system, confidence in the information provided will soon become undermined.
The other concern that I have is that it only works when something has gone wrong (i.e. an aircraft crosses a hold when another aircraft is using the runway) and so does not reinforce good behaviours like NEVER CROSS A RED STOPBAR. It may even be seen by some as a safety net that will protect them and so may not query an instruction that was not completely clear.