So every console generation has a major bottleneck, last generation it was the memory, this gen its the CPU limiting many games from achieving 60fps or causing framedrops in general.
I think Sega shouldnt just focus on getting a stronger CPU and GPU but also getting the Genesis prosessor into the next Dreamcast along stronger hardware in general.
Despite what people say the Motorola 68000 Processor was a beast for its time, if you look at exclusives like Rent a Hero or the Vectorman, they look a generation above other games during their times. Or even way before that when some developers really tried you had Bizarre Releasing Metropolis Street Racer running on Native 480i, while on Xbox same game engine and with same tracks could only reach 480p in Daytona USA, thats like twice the resolution on Dreamcast.
And its not only fanboy talk in the system wars, the data proves that the m68000 7MHz is fact stronger the current PS4 jaguar CPU running at 1.6 Ghz, below some examples by developers
I think Sega should go for a CPU by Motorola like the M68000 but also with a M68000 processor so it can be used for certain graphic effect or physics based effects to save performance on the CPU side. Especially annoying Alpha effect causing framerate drops and the likes of that. Yes the Cell is complicated as whole, but only if you try to run an entire game on it.
And keep in mind that on Genesis you had only Blast processcor and 6 Genesis make 6 blast processors for devoloping games for, 1 other were used for the Sonic and another was scraped in order to save money on production. So on DC2 you could have 3 blast corea and 8 Sonics for pure game development.
Sega doesn't own the M68000 processor, its already developed. Why shouldnt they just add it in to give the Dreamcast 2 some extra power? A M68000 processor and 72 KB of RAM combined have cost less than 50 cents in 2009.