If Ordinals is taken seriously
It all comes down to what that means. The vast majority of centralized exchanges enforce blacklists based on inaccurate blockchain analysis, and spread the notion that some coins are less valuable. Yet, it's completely possible to trade them for an equal value in a decentralized exchange like Bisq, or even in centralized swap services for altcoins.
Try to buy a U.S. 1943 steel penny for its nominal value of $0.01.
The important difference between Bitcoin and the 1943 steel penny is that a Bitcoin buyer does care if their Bitcoin is a "rare satoshi" or not, whereas a 1943 steel penny buyer is a collector. The Bitcoin seller might charge a premium if they know that Ordinal buyers are willing to pay for it, but a Bitcoin buyer will just want the Bitcoin. Or to put it this way: Nobody treats a 1943 steel penny as currency.