That website is glorious :). Yeah, I think this might go a bit far. Scratch's community sadly isn't so big, further fragmentation won't help that much I think. And the platform doesn't make a very solid impression to me. That's why I like google's idea, I hope they pour some money into this.
Yep it seems like it has grown quite a bit since I've looked at it last time. I still think a platform like this should be bigger - as in a substantial fraction of school children big. Every child should try playing with something like scratch, just to see whether (s)he might like it and go into programming. When I was a child I went straight from some learning program for children with some graphical macro editor (poor man's hypercard) to VB6 and it led me to what I am now. That's why I think it's really important what toys we give to our children.
[1] http://byob.berkeley.edu/