There is nothing wrong with going with traditional format. I do this too! All of mine are traditional/standard proportions and done in CMYK (then to RGB to post only). I also DO print mine. In fact I've sold over 250 printed copies so far of mine in the last year. Not bad for my first book. I even have a publisher. I even go by the old format as far as NUMBER of pages. My chapters are 9 pages counting the cover, and each book is 32 pages total counting the exterior and interior pages.
I WANT my book printed and sold in comic shops. It gives me access to a whole group of people. I personally would rather have a printed book in my hand than a pdf. I can't hold a pdf unless I print it myself. I can't take it to conventions and see it and meet fans, and I have done that. I've sold numerous books there and many follow me to Tapastic and THEN buy the book online from me.
So for me, I WANT to do it old school. Maybe it's because I was taught the old school methods of making comics while at art school, but something about a REAL book and not just a screen works wonders for me in terms of enjoying and experiencing a comic.
I also find people who make webcomics or those who want to be a professional comic-maker, yet never step foot into a comic shop to be a bit... odd? Like, if you are a writer, you should read books. If you are an actor, you should watch movies and such. If you are a comic artist, why in the world are you NOT going into shops and looking at other works?! Be smart and knowledgeable about you industry!
IF you are just making comics as a hobby, that's very different and I don't think it's as critical. For example, I'm most a printed artist and I'm sold in three comic book shops right now. I'm making a good amount of money at this comic thing, and tapastic, webtoons, and smackjeeves are helping me build my audience. I'm not much of an internet person... I don't really like the internet that much. But it's super handy and I can see the value in it, so I invest my time into it.
But yes, printed comics ARE still a thing and FAR from dead.