If you have FCS2 there should be no reason you cannot reinstall it.
I just don’t see what you are complaining about. If the software works for you reinstall, if you are having a problem reinstalling figure out why. You may still be able to fine a FCS3 upgrade on ebay or something like that, just make sure you get the original install disc and serial number.
DVDSP is still the best authoring software for the Mac, nothing even close. If you need this tool in your business do what you have to to get it up and running.
Apple is a for profit company, while I don’t agree with some of their discussions lately I refuse to keep bitching about it. As soon as their tools no longer work for me I will move on. I will find a way. If I cannot afford to update software when it is needed or upgrade systems to run needed upgrades then I will get out of the business. I don’t want to go to a auto mechanic that says he cannot afford to be shelling out $ for new tools and software just to keep up to date with what is needed by the new cars he services.
Keeping useful equipment and software for as long as they get the job done is smart, replacing them when they don’t is wisdom.