execoin, that is facing currently similar inflation problems as HiroCoin is reducing the block reward from 50 coins to max 20 / minimum 5 via a hardfork on the 30th of July. Let's watch how the market reacts on that one and take some notes.
Hirocoin does not face inflation problems..it has demand problems. There is not demand for HIRO because the lack of marketing.
How will market react on Execoin? My guess is there will be some buzz around it when the change happens and price will rise for a while. A lot of holders will dump it. After a while when things settle down it will go down in price and noone will ever trust the coin again since they are changing the fundamentals.