Not exactly. While there may be digital versions available, the traditional print format still exists and is popular among many fans. The switch isn't a complete one.
You can try some manga reading websites like MangaFox or MangaReader. But be careful as some of these might not have the legal right to distribute the content.
Comics are often colored using digital software or traditional mediums like paints and markers. It depends on the artist's preference and the style they want to achieve.
There are numerous One Piece comics. The series has been ongoing for a long time and has amassed a substantial collection. You might want to check with the publisher or dedicated manga databases for the most accurate count.