It’ll be harder to hack streams than physical discs. But it’ll probably be a continual cat and mouse game.
Nevertheless you skipped past the more important point. If nobody is manufacturing physical discs, how will pirated recordings be broadly and easily distributed and sold? And frankly, given the legal market for physical discs of surround music is already exceedingly small, how much of a market will there be for pirated discs?
Again, I hate to see the option of owning versions of music permanently being phased out. But it’s not going to slow down or stop.