Why, what's your issue with PoS ??
I just see it as unproven technology. Until it's seen off attacks by motivated attackers and the wims of a diverse community I fear there's something that's been missed or underestimated. I sort of feel the same way about PoW to a certain degree, but it's been put through hell and survived.
I think the first real exposure of PoS (where there will be sufficient incentive to concentrate resources to attack) will be with ethereum, so it's probably best to get it in place as early as possible so problems can be ironed out before too many businesses rely on it. At the moment, everyone involved in ethereum accepts that there's risk involved in being early. That won't last forever.