Securitizing the Listerine royalty would require setting up a Special Purpose Vehicle (basically a legal entity whose sole purpose is to own the Listerine royalty rights). It would require bank accounts to be setup to process the royalty payment. It would be considered security and as such would need to registered and regulated by the SEC in order to be sold. All this would cost a several hundred thousand dollars in legal, administrative and banker fees. This would only make sense if several hundred million dollars worth of Listerine royalties were being securitized, and if there are investors who are willing to buy the hundreds of millions of dollars of resulting securities.

None of those securitization processes could be made more efficient, secure or cost effective with an NFT or any other blockchain technology. Introducing cryptocurrency into the securitization process would only be for the purposes of a marketing stunt that would make the process more costly, complex and risky.

You say you would love to buy 1/100th of an asset that has a list price of $2 million, so presumably you would be willing to invest $20,000. Well, I have news for you, multi-hundred million dollar securitizations are not done because someone says they would love to "interact" with a "smart contract" and have $20k to invest, they are done because multiple investors have promise to buy tens of millions of dollars of those securities. And those investors are interested in earning dollars, not "interacting" with "smart contracts" for fun and games.

So no, NFTs are not ideal for this kind of asset.