But if evolution is thrown out because it can't explain new evidence I very much doubt we'll return to theories that couldn't even explain the old evidence. A good theory will have to explain all the current evidence and stand up, at least for awhile, to new discoveries.
If you doubt this, consider the fact that all of the useful and practical knowledge derived from the theory [anti-microbial resistance, pesticide resistance etc] can be summarized as micro-evolution.
Micro evolution can be [and is] assimilated by either creationism or ID, so if all of the science establishment were to suddenly become born again Christians and begin to promote a young-earth world view, the sky would not fall, as medicine, biology, genetics etc., would proceed on as nothing ever happened.
Brian.