t'll be a mixed bag, I think. Convenient sites like MangaDex could be nuked or neutered into becoming unusable (it's not dead yet, I still use it). If you respect DMCA, eventually your ass will be grass. Other mangakaaakkaakklot sites can continue to play the cat-and-mouse game, and they'll probably be at least as successful as the pirate streaming sites continue to be. I can watch almost any movie/TV show for free in seconds on the clearnet. If that's not solved, I don't see why manga/manhwa/manhua piracy would be.
Even minor barriers to entry could reduce the readership, and thus the cash flow for groups that collect donations or do the paywall shit. There could be less interest in translation, but AI is moving in to take the place of TLs. A lot of groups are already using it, and quality is generally high if you are English-proficient enough to fix mistakes. Bad TLs have always been with us; 20 years ago folx must have been plugging words into Japanese dictionaries and barely editing the results.
Obviously, you need the raws, and that's where the Japanese corporations/government can likely do the most damage, since going after the scanners fights both domestic and foreign piracy at the source.
We're not even close to tapping all of the available options. Make a MangaDex clone into an onion site and you could be virtually untouchable. Server costs should be well under those needed for movie/TV streaming. There are a lot of technically proficient weeb freetards who could take on the challenge. We don't see sites as advanced as what
Anna's Archive offers (a front-end accessing over 1 petabyte of scanned books, probably some comics but it's not a major focus).