Both interesting points, and I agree that building a new machine would costs mega-bucks and probably would not be cost effective
But the gaming landscape has changed, where digital downloads are having a massive impact on the way we consume media.
In the past I have had no interest in PC gaming... but with recent advances in technology where one can 'hook-up' a PC to the tv my interest in this side of gaming is increasing, especially with services such as Steam, to the point where I may start playing my games this way
I feel if Sega is to be relevant in the future then they need a service similar to Steam, where all their games are exclusive to it as well as having other 3rd parties games on there. As much as I love consoles, eventually they will dissappear be replaced by purely digital services accessed through PC or IPTVs. Here services like Steam, iStore will prosper with there already expanding userbase and catalogue of games. As I mentioned earlier all you would need is an updated Saturn Pad
Sega can still get into the party, as one of the unique selling points it has, is its back catalogue, which is only rivalled by Nintendo. You only have to look at the responses of gamers to the re-releases of its Dreamcast era games onto current gen machines
As mentioned many of the people that made Sega so great have left and formed their on companies and then others like Yu Suzuki
...... However if a digital Sega service 'SegaWorld' is implemented I am sure many of these former Sega employees would still work on such a service even as a 2nd/3rd party. As well as this mobile gaming has taken off in recent years, so what is stopping Sega from letting people access their content from mobile devices eg Android
This really is a wonderful opportunity for Sega to make their comeback.... So why are Sega being so blind to what is on the horizon