If the mainstream vendors won't do it, somebody else will. It's not hard to modify an installation image, or even supplement it with a customized boot manager/loader located elsewhere, to get a 32-bit x86 distribution to install in EFI mode. Thus, if there's any demand at all, there WILL be Fedora, Debian, OpenSUSE, Ubuntu, etc. images for 32-bit EFI platforms, or tools to create them automatically, or boot images that contain EFI boot managers that load the kernel from the standard media. If a vendor is concerned about reducing the OSes that will run on a 32-bit EFI computer, that vendor could provide such tools itself.