Never say "never". After all, Krause is already in digital format. It would be easy enough for them to convert it to web format - but then, if they did that, who would buy their books?
Once upon a time, there were no Krause catalogues, or anything like them.

If you collected coins from a country, you got the book for that country and if there weren't any "native collectors", then there were no books for that country at all. Eventually, more comprehensive books were made, until the situation today where the entire world back to 1600 is catalogued. But we still don't have a single series of books covering every single coin ever made.
The Web seems to me to be following what books did, just going about it faster. Right now, there are countless separate web sites, each covering a small section and putting in part of the puzzle. The next stage is to put them all together, then fill in the gaps not covered yet.
Once you've got a catalogue, turning it into a price guide would be easy - simply link it to a search on
ebay (or whatever online shop has replaced it by then).
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis