India doesn’t get it. You agree to get rid of your nukes - and then build them in secret anyway - all but the U.S.
Practically speaking, until the UNSC adjusts its veto membership to be “reality based”, and likely creates a mechanism to do so automatically, it will be crippled.
The Cold War membership reality has changed. Today, there are four elements that are essential to membership. The least of these are nuclear weapons, or at least the ability to rapidly assemble them. Far more important are:
1) A major economy.
2) A large, modern army and navy capable of force projection.
3) The willingness to force project for UNSC, not just national objectives.
Having a major economy makes that nation an economic nexus, with complex trading arrangements with many other nations. This means it must engage in international shipment of goods, in international waters and airspace.
Right now, and in the near future, this means the US, China, Japan, Russia, the EU, India, Mexico (once the PPP is built), and likely six other economic blocks: northern and southern Africa, the Middle East, South America, ASEAN and Oceania.
A large army and navy capable of force projection is much more limited in membership. The US, China, Russia, India and possibly the EU and Japan if they decide to have such a military.
The willingness to force project is the greatest discriminator. The US, China, India, and possibly the EU and Japan again. Because of this limitation, it is likely that a permanent professional military force may be created by the UN, specifically for UNSC objectives.