As someone who'll join law school this year, I'd love to listen to the opinions of more experienced people on this.

A lot of countries already have 3 or 4 year law degrees straight out of school, should we thus have the same?

Also,

Will the Supreme Court even entertain the plea?Or will they brush it aside?

I personally am for the proposition.

As a preliminary: You really don't get to argue in the apex court of any nation over any old issue you are unhappy with. You need to cross a public interest barrier and show that you are raising a genuine problem with the law as it is right now.

However, setting that aside (assuming you can demonstrate why you are raising a novel issue), here's my opinion, for what it's worth. I attended university in a country which has three and four-year law degrees, reading law right after high school. Frankly, from that experience, I don't think it's a good idea to shorten the law degree. It just doesn't give you enough scope to study and specialise in as much depth as you might be able to, otherwise. I did a three-year LLB myself, and frankly, there was so much stuff in terms of the electives my uni offered that I wanted to study, but just didn't have scope or time for. Alright, you can do a master's if you want further study, the argument will go. And yes, I am doing a master's. But still, I think more time and scope to specialise more deeply in an undergraduate degree would be better preparation, not just for legal academia, but for legal practice, too.

Frankly, I think the designers of Indian undergraduate law degrees are making the same mistakes as many of their counterparts in other countries. They take up so much space in the curriculum with core courses and/or non-law courses, that even in the five-year system, a lot of time gets wasted. So perhaps if you don't like the idea of being forced to use scope to specialise further, but are happy to argue about why the Bar Council of India (which regulates Indian law degrees) should be less prescriptive (prescribe fewer core courses, therefore offering students more scope to specialise and therefore shortening the law degree), you may actually have a point.

I believe Ireland might have a few law schools which offer an undergraduate three-year LLB, but most that I know of have a four year LLB course. Australia and New Zealand are also mostly four years straight out of school, and I do know that UNSW has a BALLB of five years duration, like what is there in India.