I completely intend to print my comic, and that intention was one of the things which made me initially resist working in a vertical format. I've since relented, because I've come to really prefer working vertically - it helps my pacing immeasurably, and I find it way more fun - but I still want to print a book!
I'll be getting my hands on the first issue of The Croaking once its Kickstarter is finished, and I'll be looking closely at that to see how the artist has reformatted her comic from the scrolling version. I think just having a good sense of page balance should be enough to make a decent looking reformat, and being willing to repaint a little where necessary. The 'bad' examples you posted suffer from weird and inconsistent panel sizes, which really; that shouldn't be hard to avoid. Crop where needed, expand where needed, and avoid clunky looking bleed panels unless there's a really good reason for it to be a bleed panel. It probably won't look as good as a comic which was designed in page format from the beginning, but that's the trade we make in order to have something which looks really good when scrolling.
Having a printed book does have a lot of advantages. You can sell it at conventions, markets, book fairs, and you may be able to convince a local comic book store to stock a few copies. That's more than enough reason for me to put the time into reformatting for print.
