I agree a pathing system would be fun, and agree GW2 had a decent implementation of this.

I don't think removing tomes is a great idea. However, you could have a set amount of bonus tomes for the first run of each path per day. Say total run gives you 20 esoterics, but if you run the roulette you get your bonus and if you run the path for the first time that day you get an extra 20. That will encourage people to play each path, instead of just the most 'optimal' path over and over.

This is how I feel about Fates too. I have 0 idea what any dungeon or fate is about, as the objective is always the same, kill everything!!