Sega are kings of giving you almost what you want, but then screwing you over somehow.
People want a PD Saga sequel, they get PD Orta (not that that's a bad game, it's just not what everyone was asking for); people want Sega Rally 3, they get some remake of a past game; people want a Nights sequel, they get mini-games using the characters; people want a Phantasy Star sequel, they get PSO.
Now no matter how good these games are, in the end they still leave people begging Sega for what they wanted in the first place. Not that Sega shouldn't try new ideas, they just maybe shouldn't use the franchises people are desperate to see a true sequel for (unless they're making that too).