Fil-C does seem like a quicker route if your existing idea was something like "rewrite it in Java" and it exists today whereas both C and C++ have only vague ambitions to deliver some future language which might meet your needs.
I will be very surprised if there's widespread adoption of Fil-C for many new projects though.
A big stumbling block is that Fil-C requires all C in the program to be built with Fil-C, including all libraries. That means that Debian and such would need to either adopt Fil-C (perhaps for some distros) or ship Fil-C and non-Fil-C libraries for all pkgs with libraries. The alternative is that you have to build everything yourself, and this gets painful if you need to support ELFs/DLLs.
I will be very surprised if there's widespread adoption of Fil-C for many new projects though.