Hello, Anderson.
The trend is really that, but that does not mean that Web Forms support will be removed from Visual Studio, at least not yet. Even Web Forms had updates to the new version of ASP.NET (Web Forms 4.6), but the focus of the efforts will be rather on MVC. Web Forms will not keep up with all the new features of the ASP.NET platform and will soon become obsolete.
Of course, for small, quick projects with little maintenance, I do not see problems using Web Forms (although I would not do it anymore today), but considering the current web and market scenario, it is no longer feasible to invest in Web Forms for new large projects (in fact, small projects can grow too, right?).
Unless you have a good reason to use Web Forms in your new project, I advise you to go to MVC, which is a current platform, is constantly updated and provides us with several resources to develop the most varied types of application . MVC also allows you to invest more on the front end, ensuring a more user-friendly and more flexible end-user interface for the programmer.
Well, in short, that's it. Thanks.