See comment above, but Sidious still had his Plan A. The clone army is in production in the Jedi's name, and the Galactic Civil War is already started. Literally all he needs is a pretext to draw the Jedi Order's attention to the former as a solution to the latter, and his plan to topple and almost completely massacre the Order with one booby trap is ready to go off.
Padme surviving is an interesting question. That could have interesting changes. But the fact that neither Padme nor the Jedi know who Sidious is probably means she's relatively easy for him to get rid of the old-fashioned way if he needs to.
The more long-term effects of leaving Anakin on Tatooine are harder to grasp. If there's no Anakin, there's no Luke or Leia. If there's no Vader, there's no-one with Jedi powers directly at the Emperor's side to kill him. So the Original Trilogy follows a significantly different trajectory. Unless Sidious got a different ex-Jedi apprentice who had a change of heart, anyway.
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Padme surviving is an interesting question. That could have interesting changes. But the fact that neither Padme nor the Jedi know who Sidious is probably means she's relatively easy for him to get rid of the old-fashioned way if he needs to.
The more long-term effects of leaving Anakin on Tatooine are harder to grasp. If there's no Anakin, there's no Luke or Leia. If there's no Vader, there's no-one with Jedi powers directly at the Emperor's side to kill him. So the Original Trilogy follows a significantly different trajectory. Unless Sidious got a different ex-Jedi apprentice who had a change of heart, anyway.