I would question the proper implementation of this activity within the brainstorming process. The article mentions how typical brainstorming sessions are dominated by extroverts, so I think that stereotype would seem into this technique as well. I think it would also discourage people if nobody puts a sticker on their sheet of paper. So I think this would work in already well established group of individuals.

I think this a cool idea! This taps into more of the process side of ideation, getting down to the nitty gritty of what is physically possible with an idea. I also think that this is a charming bridge between artistic people and structured "real life scenario" type of thinkers.