[HigginsNinja]

I definitely do not have the level of experience that you have so take this with a grain of salt. I have seen and worked in a lot of companies that have a very heavy portion of their code base in web forms. Many of these companies have been working to transition to MVC but it takes a longer time the larger your legacy beast is.

I would suggest finding a job where you can leverage your experience in .NET Web Forms, while picking up the pedigree for MVC.

[RefactorCareer]

I haven't found positions like that open to people without MVC experience on their resume, but that seems like a good possibility to focus on. I could easily take an open source webform app and convert it to MVC as a portfolio builder.