I really can't see much use for this. I mean, it would be nice to have some of the great treasures of western culture available to all without being restricted by copyrights, but there's so much more to performing a symphony, especially a great one, than just playing a C-sharp when the sheet music says so. Interpretive choices and abilities are what really make the music great, and I just can't see a budget pick-up orchestra led by a rent-a-conductor doing a good job. If they were capable of such, they'd be charging a lot more. On top of that, even if there is one open-license performance, and even if somehow turns out to be a good performance, so what? That won't alleviate the need to buy others. This is one of the great things about classical music--each interpreter adds his personal stamp to the work, and performances can differ wildly (compare Glenn Gould's 1955 and 1981 recordings of Bach's Goldberg Variations to see what I mean). The major benefit this will provide will be for people who need to use a Beethoven symphony in some other work, for example a documentary or the like, but that's about it.
I know there are those (perhaps many) here who will argue that something is better than nothing. I disagree. Who wants to listen to a boring, lifeless rendition of a great masterpiece (something sadly common enough with professional orchestras)? Even for education, I can't see this having a great use. Boring children with mediocre performances can only have one outcome: that they won't care.
In short, I would suggest that those behind this project are doing it more out of a political motivation (one that I happen to share) than out of a true understanding of or appreciation for classical music. This error (and there really is nothing else one can call it) of conflating a performance of a symphony with the symphony itself or even assuming all interpretations are equal is just so fundamental that this whole exercise strikes me as a waste of money.