I'm willing to give this movie a chance, but as its own thing. No one can do Teal'c or Carter better than the original actors, and Shanks/Anderson were the best versions of O'Niel and Jackson. Just leave them alone and make a reboot movie using the concept of the Stargate by itself.
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I don't know. I think Laurence Fishburne and Sharon Stone would do well as Teal'c and Carter respectively

Yes, i've thought about this for awhile
Apparently even some of the SG-1 cast has thought about this making some jokes in the past.