PS3 is nothing like the dreamcast. When dreamcast came out...things it offered couldn't be experience anywhere else. The amazing visuals, online, plethora of AAA games, ease to develop for...which lead to homebrew and emulation
As a gamer I don't see much diffrence between what ps3 and 360 offer and ps3 was late to the party and is more expensive. Those 2 basically copied each others busines model (with ps3 doing most of the copying) while DC was an innovator ona ll levels and well ahead of the curve.
Also, if sega had 1/4 of the funds sony sunk in to the ps3, Dc would have spanked all consoles last gen. Sega was losing 300 mil a year in 2000 and 2001 and they almost went out of business. Sony was losing over 4 times as much a year or 2 ago and that is with the PS3 + 2 other profitable platforms.
