I mean, just looking at the franchises that sold well on the PS3, is there anything we're not expecting to show up on the PS4?
Does it necessarily matter?
I'm looking over the list of PS2 games that sold 500k+, and they basically all showed up on the PS3. Dragon Quest is really the only notable exception. And yet the PS3 is down like 60% from what the PS2 sold.
Dragon Quest - missing this one
Final Fantasy - yep
Gran Turismo - yep
Dynasty Warriors - yep
Kingdom Hearts - well, nothing got a mainline KH game this gen, but PS3 is getting an HD update compilation
PES - yep
Hot Shots - yep
Samurai Warriors - yep
Onimusha - didn't exist this gen
Jissen Pachislot Hokuto no Ken - yep
Metal Gear Solid - yep
Mobile Suit Gundam - yep
Tales of... - yep
Taiko no Tatsujin - missing this one
Warriors Orochi - yep
Dragon Ball Z - yep
Super Robot Wars - yep
Derby Stallion - went portable
Ridge Racer - yep
Yakuza - yep
Monster Hunter - HD port
Devil May Cry - yep
Ratchet & Clank - yep
Virtua Fighter - yep
SD Gundam G Generation - missing this one
Star Ocean - yep
J-League Pro Soccer Club - went portable
Daito Giken Pachislot Simulator - yep
Momotaro Dentetsu - missing this one
Jikkyou Powerful Pro Baseball - yep
Resident Evil (topped 500k with budget release) - yep
So the PS3 basically lost Dragon Quest - and nothing else of relevance. Monster Hunter basically shifted portable in its popularity (but PS3 still got an HD update of the most popular game in the series), but it was never very big on the PS2 anyway, so that didn't affect the PS3 at all. And Taiko was already under 200k per release by 2004, and the latest entries on PS2 didn't even reach 100k, so that was irrelevant to the PS3. And the PS3 added a few new successful franchises (Gundam Musou, Hokuto no Ken Musou, White Knight Chronicles, One Piece Musou, Dragon's Dogma, etc.) to help replace the very few that didn't make it over from the PS2.
And the PS3 won't even sell half of what the PS2 sold before the PS4 is on the market - so even if the PS4 gets 90%+ of the PS3's biggest series, that still doesn't mean anything in terms of whether the PS4 will sell as well as the PS3 or not.
The home console market dropped a good 20% this gen - there's not necessarily anything stopping it from falling (or rising) another 20-25% this coming generation.