Be sure that the relevant persons at the RPF are aware of this issue, and I have even advised them to switch to a better diode, like the PMEG2010AET. If it will happen I don't know, there is also the "little problem" of an 1/3 increase of current consumption when you use such an adapter! In fact the makers of such adapters are consciously making something that shouldn't be allowed to be connected to the HDMI bus, which specs the maximum current to be drawn from this supply voltage at 50mA! In fact this "supply line" is only intended for the small EEPROM inside the monitor that contains the monitors characteristics, and those typically need only 10mA.
A much better solution would be a powered adapter, and only the cheapest ones don't have it! If you use one of these the solution is to buy a small and cheap ($3) adapter that combine a male and a female HDMI connector with a (barrel) 5V power input.
Why would the RPF redesign their hardware to support stuff that breaks the HDMI's commissions technical guidelines (rules)?
Lets start recommending the small adapter, (plus separate 5V power supply) as the preferred solution for people having bought an unpowered VGA converter already.
You can buy such an adapter here: http://dx.com/p/hdmi-male-to-hdmi-femal ... ack-155361