This is a good initiative. I find it interesting, but it should be limited to a specific period, say, half a year or a year, so that all participants can work on it.
But, as we have already discussed, assessing who could persevere for that long is difficult. I know very few people offline who would even be willing to do that, because everyone lives in their world of projects and ideas. I can't tell from online acquaintances, so it's hard to estimate. Just keeping on Hive and posting, along with something else, takes a lot of time.
What kind of stuff did you have in mind for building?