It is true, hypothesising what-ifs takes imagination and spontaneity, not so much history knowledge. It is running around in a room, blindfolded. I see little reason to continue this discussion (although it is probably going to do so).
However, one certain effect of Caesar's survival would have been the grandiose Parthian expedition he was planning for the summer. Who knows what he could have done there... True, holding on to that territory would have been difficult, but suppose that Caesar was genius enough to do that an to defeat the Parthian mounted armies. If he subdued that region, then Rome would have been so radically changed, without its main arch-nemesis.
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