After the suggestion, I also looked into 123D, to come to the same conclusion you already have. It looks like they are marketing Fusion 360 to fill the void. It has similar features, and has a "hobby-ist" clause in the license. If what I'm reading on their forums is true, most of us would be able to get it for free. I'm still under the 30 day evaluation period, but plan on looking into it further.