Wubi is no longer under significant development and has some major failings in the modern world (e.g. lack of support for Windows 8 / UEFI). I really can't recommend you spend much time on it.
According to statistics done by Baidu, the most popular search engine in China, and its partners, Windows XP has more 70% OS share, Windows 7 has more than 20% share and Windows 8 belongs to Other(其他) that has less than 1%.
Ordinary users can do almost everything in Windows without typeing any command into a scary "black square" like a black hole. But when they use any system in linux family, we have to do that a lot. Most of the pro users treate this as a freedom, but ordinary users think that is a challenge.
What's more, I have to say that most of software of Windows are more friendly, although sometimes when they crash we don't know what going on.
Please don't derail this bug into a discussion of relative
user-friendliness of Linux and Windows, whether one needs to use the
terminal, and so on. It's not really relevant to whether Wubi is
supportable.
Wubi is no longer under significant development and has some major failings in the modern world (e.g. lack of support for Windows 8 / UEFI). I really can't recommend you spend much time on it.