Yep.

I wouldn't be at all surprised if it turns out that the square footage you need for an open plan office plus a sufficient amount of meeting space ends up being greater than the square footage you need for a more traditional style of office. The last open plan office I worked at was probably 1/3 meeting spaces, and it still didn't feel like enough.

Yes - this is because cubes double as offices for small meetings. For every cube you remove, you also remove a 2 or 3 person office.