In principle, the idea of DVD@ccess or creating enhanced content DVDs is rather cool. In practice, the experience was never anything but variable. Whilst DVD@ccess seemed to work for Macs, and some PCs the result was never reliable on a PC. Alternative solutions on PCs, including Sonic's eDVD, have also since been abandoned. There is no single standards based system for creating interactive links and that is what is needed for all discs to work.
If you want to put a microsite on a DVD then you can, and you can use a menu screen to inform your viewers that it is there. All that is missing is the ability to click a link in a menu and run the index file. You might get it working for some people, but not for all... but if you include it on a disc then at least there is something there for them to see.
The other thing to consider is that if you do include some HTML pages on your disc, when they are played in an internet enabled PC you can rely on the usual html links to call up further content not based on the DVD.