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In contrast, if SC3 was.... say, set on a volleyball court where the goal was to try on different swimsuits... that's *too much* innovation. It would alienate the fans. That's what needs to be avoided
I'm sorry if this sounds like flaming (cuz it kinda is) but apparently you've been taught an inadequate interpretation on what it is to innovate. What you're talking about now is complete silly talk.
Having to EAT in a game like GTA to survive is an added innovation...good or bad, that's not my call. But THAT'S innovation, something that impacts the game enough that you can tell and feel how it's different from its predecessors in an original way but doesn't change the format of the game. What you're suggesting is ludicrus!Does GTA suddenly become revolved around EATING?

NO!! Of course not! But that's the way you're looking at it according to you flawed deffinition.
Don't like innovation? Then where would the zelda series be? Remember Z-targeting??? That's not the classic formula bud, that's completely different than any other zelda component in the past. But it made the game better. Heck, where would fighting games be?? You put SC2 as an example, but hey, street fighter 2 is the epiphany of what fighting games are. I mean, at least it was back in the day. But why change it? Why innovate at all if the formula worked SO WELL the first time? Why don't we have fighters that are all simple SF2 rehashes with tons of ryu clones and better graphics? We don't, it doesn't work. The mere fact that you stated SC2, an awesome game that's completely and utterly different than it's highly praised original grandaddy (SF2), is quite ironic.
What you're saying, put in a little extras, amp the graphics, maybe some fan service, that kind of junk may work for maybe...oh...ONE SEQUEL, and then your done. Look at the mario party games...do you remember when everyone thought they were SO DANG FUN? I do...and nintendo does too probably. They DIDN'T really innovate, but simply did what you're suggesting, and now look at how stagnant the series has become. Do you want a zillion of those? I didn't think so.
So all in all, I disagree whole heartedly. While the type of sequel you're suggesting may work occasionally, but in the long run they can never fly. The army man games is a good example, along with Tomb Raider, Spyro, Crash, Madden, Dynasty Warriors (actually, DW4 is pretty awesome, but 2 & 3 were carbon copies), and the previously stated Mario Parties. Is THAT what you really want to be playing?