If what you are saying is true, and Bitcoin is truly uncensorable, any attempts to censor it will just fail but might mitigate less appropriate uses by slightly deterring them, after having spent lots of time arguing and freaking out about it. Nothing stops Bitcoin's success.

It's all about voluntary choice. If noderunners understand what they are doing and make their own choices and assent to this version of Bitcoin, then whatever spam gets in their chain is actually legitimate. They consented to it. They also get to voluntarily discourage it from the mempool policy side of things.