It's probably not a huge work to make it compatible with VB.NET.
However, the CSHTML5 compiler automatically generates some C# code during the compilation process, and we should change the compiler to generate VB.NET code instead. For example, XAML files are converted into C# files (you can see them for example if you open "obj/Debug/MainPage.g.cs"), serialization assemblies are generated as C# files, and WCF Web Services ("Reference.cs") are expected to be C# files by the compiler.
If you would like to contribute to the funding of VB.NET support, please feel free to contact us at firstname.lastname@example.org and we will send you a quote/timescale. If multiple companies are interested in this feature, perhaps it is possible to join forces to fund it. We encourage those who are interested to contact us and/or to reply to to this topic as well.
By the way, at the time of writing, this feature request has already 44 votes on UserVoice. Please be sure to vote for it as well:
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