Now that new Dominon sets seem to be continuing indefinitely, I'm ok with similar ideas reoccuring. This is coming from a very harsh critic of any and all wastes of card slots in the "Guilds is the last set" era.
There are so many cards now that seeing a particular card in a given full-random game can be rare, and you'd want to increase the probability of it reoccurring. That's done with Village, Smithy, Workshop, Peddler etc. but it should also be true for slightly more niche cards.
Or if an idea is good, why not allow access to the idea in different sets?
I'd be ok with blatant things in future sets like "Quarry but it's an Event costing $P", or "Distant Lands but it trashes itself for VP tokens".
Similarly scrapped ideas that weren't particularly interesting would be fine for revisiting (Like the top-deck Remodel that was replaced with Rebuild) as simple cards for future sets.
All of this is fine as long as each set is decent value for money, and with Projects, Renaissance looks like it will be.