Question: Planning on writing a picture sci-fi book about Utopia.
The book will not have a plot (story), sequence or any conclusion. It will have approximately 30 illustrations generally depicting a search for Utopia, accompanied by minimal text for each illustration. Similar to a photo book.
Has anything similar to this been published before?
Could this spur sufficient interest?

Answer: 
Only an outsider can help you. Find someone you can trust to honestly review your work, such as a close friend or relative. Internet critique groups might be helpful.

Be very specific that you want them to read looking for flaws, otherwise they'll just look at the good parts and give you the generic "that's good". Parents are specially prone to this.

After you get one review, get another. And another. 5 or 10 should be a good number. Then look at all those reviews and try to find the parts most of them complained about. Those are the parts you need to worry about fixing right now.

Also, don't oversweat this. When you start to actually write, a lot may change.
The story must interest YOU
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When I started out, I did exactly that: tried to do stuff specifically for others, and well I did not do so well. The material I came up with was... underwhelming. Then I started reading other people's stuff. I quickly realized that the material that interested **THEM** interested me **ME**. 

I asked myself that exact same question, followed by *"what am I doing wrong?"* In a moment of frustration, I decided to write something I wanted to, ignoring all the data I read about what people want.

To my surprise, my readers thought it was awesome, fresh, and filled with excitement. By doing something you love, it will come through your writing. Write the story for **YOU** first and foremost...