This isn't a subject I follow closely. It seems to follow a well-worn trajectory, though: Start with user-friendly tools that make things easy to do, then replace them with professional tools that eliminate the user-friendly part in exchange for industrial-strength functionality.
Interestingly, it appears Microsoft is now avoiding any suggestion that Expression Web is the successor to FrontPage, a replacement, or in fact has any connection at all.
It's simply discontinuing FrontPage (presumably due to lack of interest -- something I find remarkable) and simultaneously launching Expression Web, abandoning its FrontPage customers entirely in the process.
For CIOs and CTOs, this sort of situation can be particularly challenging, because the challenge goes far beyond losing a critical feature. Potentially it means having to run on obsolete software while charting a project to convert entire applications to a new platform; finding third-party solutions to fill the gap (making the architecture more fragile in the process); or developing work-arounds in-house (also making the architecture more fragile in the process).
You didn't ask for advice, which is just as well because I don't have any useful advice to offer. Your alternatives are obvious -- accept Expression Web's limitations, or find a better alternative.
I just thought you might feel better, knowing that other folks in IT face equivalent challenges on a regular basis.
Misery does love company, doesn't it?