Another thing I just thought of... It'd be pretty hard to swallow if the Dreamcast versions of these Atomiswave games were being sold at $399 a pop, like AES. Now, if Sammy had its own home console based exactly on the Atomiswave specs, like AES was to MVS, Sammy could easily charge $399 per game. The new hardware wouldn't be "home console" caliber anymore, regardless of how cheap the actual console and games are to make, manufacturing wise (ignoring R&D costs).
In reality, we can look at Nintendo's N64 console. The decision was made to stay with a cart based system versus a disc like the PS1 because of load times and piracy concerns. The prices of the games were still at or sub $50 per title, especially after memory prices came down in the mid 90s. Cart systems aren't nearly as expensive to manufacture as they were 15 or 20 years ago. Granted, they're still much more expensive than manufacturing discs, but certainly not cost prohibitive.
Sammy might actually see the need to introduce an Atomiswave home based system. After all, an industry powerhouse is developing games solely for their arcade hardware now, so there is definitely some draw to their system.