I think this new mystcraft is extremely convoluted and unintuitive. Ignoring the entry cost for a moment, lets just look at the systems in place:
Instead of a neatly organized tabbed book, we have this massive wall of pages that all have identical-looking symbols and no way to search nor sort, except manually. To actually make an age you have to make a new notebook, click the book into the desk, click the ink into the desk, click the paper into the desk, click the pages over after trying to find the right symbols among the wall of identical looking symbols and once you're through with that, you need to click the book out of the desk, open the book and rearrange all the symbols so that their in the right order, open another block, click in some leather and then click in the book to get a third book, make yourself a linking book (that can no longer be modified legitimately) and finally you're off to a new age that may or may not be stable because we still have no ingame feedback that tells us that kind of information.
Oh and my first age I created, a simple single biome, ocean, lava with a rainbow crashed and destroyed my testworld.
Don't get me wrong, I think the idea of making mystcraft a sort of collectible card minigame is brilliant and would love to see that become a thing on servers ("I've got void and will trade it for lava!").