This franchise is far from screwed. SM1 and SM2 were well done, and they just need to go back to what was working. SM3 was crammed cause they were unsure people were coming back, thus they had to wrap it up, and Arad got greedy with adding Venom to the mix. I agree Sony will inevitably dictate what happens to Dunst, but I do think she has more pull in this series than Holmes in BB or Howard in IM (especially cause Raimi wants her back).
We agree on Venom at least
No, because it might be cheaper and more cost effective
They decided to go the expensive route and bring EVERYONE back. Is that the actions of people that were not satisfied with the last movie? If they were truly upset, Raimi and co would be gone and a new cast and crew would be in, so epic fail on your part. They are so confident, they may shoot them back-to-back even. This is showing FAITH in the creative team and cast, not displeasure. Again, it has nothing to do with quality. Raimi and co have made them $$$, and obviously, they were happy with the money they got. Cause they rehired them.
As for Venom, Venom is a lame villain. You are obviously a Venom fan and won't agree with me here. But, he is a glorified stalker whom Peter is "scared" of, only reason he is at all "cool." He's really done nothing of significance to Peter ever, but be a stalker. At least the GG was an effective stalker in his day. Venom is just a nuisance. An entire movie of Venom randomly popping up is lame and stupid. He works best as a 3rd act villain. The symbiote story I feel can easily carry one whole movie, but a back-to-back movie will end like POTC: DMC and POTC: AWE, good first part (DMC) and uber lame second part (AWE). Also, even give Venom two movies. Raimi would have still made him a Peter doppleganger with Topher Grace in all likely hood, so does it matter he lasted a whole 15 minutes? I don't.