I bought a Mac about 2 years ago and had some of the same problems with needing Access for my Mac. The truth is that Access is not going to be replaced with a program like FileMaker. I have used it and it is very limited in its features unlike the Access application. Another problem here with the original question of having someone move toward using a different application like that of FileMaker and MySQL is that is in not as easy to make the Forms and have the same look and feel that has been already created in Access towards the new application. Thus yes you can move the raw data towards one of these new programs but any Macros, Forms, and Reports that were built in Access would be lost. This would all have to be recreated in the new application and this could be a painstaking process.
I love my Mac, but there are somethings that make it difficult as a Mac user when certain applications are not available. I have used the VPC 6.0 and yes it works fine, but it is not on par with a PC running the program natively. For the suggestion of having these people switch to a new platform without fixing the problem of moving away of Access first may only frustrate them and give Apple users a bad name for the shortfall of not having that particular program available. I would suggest first for them to move towards a program that would be able to run on ALL platforms PC, UNIX, LINUX, and OSX. Once this is done moving them towards a new platform like OSX is not unpleasant and is perceived as a wonderful change.
For Access not being built as an Mac application, I was under the understanding that Access actually uses the windows engine to facilitate the program, (lazy on the part of the programmers) this means the program itself doesn't use its own engine but the OS's. If it crashes it more or less means reboot. MS realizing this problem doesn't care to fix it because it is not meant to be a big DBase program anyway. As large companies go Access is not what they use, Oracle or many others would be an obvious choose. My guess, if MS had the choice they would rather drop the whole application. This is why all the new features of their office programs are in every app but Access.
Todd