That said, the purpose of ordinances is so that urgent or extraordinary situations can be dealt with even if Parliament is not in session. They are not a substitute for ordinary legislation - using them as such is a violation of the separation of powers that is the foundation of India's constitutional scheme. But the government seems to be using ordinances - at least, it has in this case - exactly as a substitute for the hard work of earning parliamentary consensus. This is a poor precedent. The Centre has rarely, if ever, done this; at most, history records some state governments using ordinances in this way in the distant past - Bihar, in particular, became famous for such misuse in the 1970s and early 1980s. On that state's behaviour, the Supreme Court said in 1986: "A constitutional authority cannot do indirectly what it is not permitted to do directly. If there is a constitutional provision inhibiting the constitutional authority from doing an act, such provision cannot be allowed to be defeated by adoption of any subterfuge. That would be clearly a fraud on the constitutional provision."
To avoid this, the government must simply wait for a few months, as the Constitution provides, and call for a joint session of Parliament. The prime minister himself has said he does not view the amendment as a "matter of life and death" - so not taking the time to do the right thing, constitutionally, is doubly puzzling. The sky will not fall if the 2013 law remains unaltered for a few months. In any case, ruling by ordinance is a British legacy of retaining control by the Crown. That's not exactly a good idea.