The amount of misinformation around this topic was absolutely nuts over the past few days. Good rule of thumb: if a YouTuber or other influencer was pitching doom and relaying this rule change by S&P as a fait accompli, stop following them.
(It was a common misconception on this thread: https://news.ycombinator.com/item?id=48364055.)
Yes, I think given that misinfo this was probably the right decision by S&P, everyone would be saying I told you so and screaming about providing exit liquidity.
My prediction is that this will overall end up costing index holders money though. They will ultimately get a worse entry price for SpaceX and the other mega IPOs. Only time will tell.
What's the urgency to bend the rules? It is not like SpaceX is banned for good. It will be included as soon as it meets the requirements.