Whatever the merits or pros and cons of the discussion, I wish people would stop putting up strawmen. No one but Auran knows the $ cost or space required to maintain old stuff. Zec has already said that there is a real programming cost involved. If you don't want to believe him or think that it is irrelevant, that's your prerogative.
First, there is no need to be insulting. As an aside, "strawman" means to argue against a position that nobody is holding, which isn't what you are accusing me of doing here.
Second, while nobody but Auran knows the exact cost of keeping the old stuff around, anyone with a technical background and internet access can make a pretty good educated guess - commercial web storage isn't exactly an obscure corner of the industry. If the Trainz franchise continues for even a few more years the size of new content will quickly dwarf the old (due to more complex models, larger textures, etc.) rendering the costs of keeping the latter around relatively unimportant.
Finally, regarding programming costs, Zec is talking about maintaining access for the downloaders in old versions, not just keeping content around, which is what I'm talking about. On the link you provided he indicates that they will try not to remove old content but stops short of saying it won't happen.
Regards,
Rob.