I loved this idea when it first surfaced 15-ish years ago; and while technology has certainly advanced a great deal in a variety of ways that may make something like this far more feasible today, there are still a host of technical concerns that would make it difficult.
Note that the link was to an old campaign that didn't get enough traction to go forward. The founder said that unless he got at least 1000 people interested enough to contribute, the project wouldn't proceed. He got about 115 backers, I think. Presumably there is just not enough mainstream interest today to make such a thing happen. For those of us who love old film cameras, perhaps this is a shame- but perhaps not. Film is still being made, and certainly has handling and imaging characteristics that differentiate it enough from digital that the two can coexist. It would be nice to drop a film or a digital cassette into the same camera and be able to shoot either medium seamlessly; but the hurdles are pretty huge and I think we have moved on.