Dual Pricing of Diesel for pasenger cars

I was just reading this article the other day (http://economictimes.indiatimes.com/news/news-by-industry/energy/oil-gas/carmakers-fume-over-government-plan-for-dual-pricing-of-diesel/articleshow/9488287.cms) and have been following the developments over internet and TV. The talk on this thing has been on for more than a year now and I am surprised how such an "accomplised bunch of policy makers" cannot take a call on this any sooner. I understand from the "political angle" that they are trying to make a consensus by sending feelers to the general public. But hey, there are more important things to take care of in this country. Why don't they just add a "cess" to this whole business of selling diesel cars and consider it done? D-UH ? Or am I missing something here?