I agree: they have to go. It is an annoying and personally intrusive methodology. Bad enough they get to do split screens, advertising the next show while the credits are on, PLUS a voice-over for some other show.
There still exists a law limiting the number of minutes per hour that a network can advertise, although I don't know what the max is now... it sure is a lot higher than it was, 20 years ago. The public used to be notified of changes coming; now they just "appear". Too much successful lobbying on the part of the networks. AND the specialty channels, which is a pay-to-use setup, do the same crap.
We've seen enough. The corner-logos are intensifying and disgusting and, as you say, growing ever larger. One of our channels here has the logo explode with fireworks, which totally pulls you away from your show and fills up an ever larger chunk of the screen.