Love the innovation, it might be far from perfect but any step in the right direction is a good one.
Slightly off topic but whilst I think the idea of the stem guard style system is the right way to go, I think the pricing is a real issue, a senior stem guard in Australia comes at a RRP of $89 on top of the $150-$300 that you've already laid down for the helmet, a piece of equipment that, if you follow the manufacturers, should be replaced after one impact, which most people would experience atleast once a season, safety is important, but it's at a point where is just isn't practical for alot of people to buy these things.