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that's what most coin-op hardware machine is doing. But it's not exactly streaming, the 68000 is sending via ports the spritelists (since the neogeo is not using bitmaps but sprites, toward the VDP, which then from what it gets know exactly what to display and where (backgrounds and sprites, and if animate them is required, and which speed use (yes, the neogeo has a hardware possibility about the speed used on animation, very clever). A neogeo cd game works like a computer for loading files, and still use the tile things from the mvs and aes systems. This means the game code load each required files in ram, and the associated sprite-lists. The main advantage these systems have is that the video tileram is dynamic, it can be very quickly filled, erased, modified on the fly with no risk of ram fragmentation for instance.
The megadrive works the same way. The tile/videoram is connected to the VDP which then organise and display the sprite (animate them too, etc...)
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