About file size. There are several issues.
1. ArcadeOX 1 can not handle files much larger than 20MB. This is being addressed in AOX2 and should be fixed but needs some more testing to be 100% sure.
2. Dial up can not handle large games. Most people have broadband though so this isn't an issue.
3. Bandwidth and file space are limited and expensive. They have to be paid by something. Currently they are paid for by ads and donations. If we added many huge games then that probably would not cover it. I have a solution for this but it will not be available until probably 2011-12.
That means RU will only have a few 20-50MB games this year. In other words 2-5 times are currently largest games.
As I said earlier, AOX2's main focus is being usable on other sites, not just RU. That means if other sites want to use if for large games and have the ability to pay for the bandwidth and filespace then they can. With the possibility of it eventually being used for stuff like
Home | Dungeons & Dragons Online. DDO is nearly the size of a DVD so it is a bit of an exaggeration but was the best example I could think of off the top of my head.