There are people who have a special affection for 650B bikes. It's a taste, somewhat of a refined one that you can only appreciate if you have it. More than that, it's a tradition, like tweed sports jackets and pipes. I would love a 650B wheeled bike myself, if only because at 5'3", my frames are always a little small for 700C wheels. But there's no way I would buy an expensive and relatively rare bike like that just for commuting. Just get something you don't have to worry about too much. Of course, if you're independently wealthy, then no problem. Get the Bleriot by all means if you want one. It's a superb bike for general pleasure riding, I think. But get something you can afford to lose or break for commuting.