Yes, this is literally true in a boring way (Anakin without Sidious doesn't become Vader) but it doesn't mean anything about the Jedi not falling or balance in the Force or the rest of it. Say Anakin never meets Padme (or she is killed in the battle for Naboo and never gets back to Tatooine), that's no guarantee he doesn't meet somebody else and have Force-sensitive kids with them. Luke and Leia might have got a lot from Padme, but not the Jedi part.