Tom could still be born
Jodie was still born so Tom could still be born. If you go by the theory that each character had to born under the exact same circumstances as before the cabin, down to the same egg and sperm, than Jodie would probably not have existed.
Changing the past by saving Hans makes it unlikely that Samantha and Adam had sex under the exact same cicumstance that produced Jodie the 1st time round. Yet Jodie is still born. So maybe Tom can still be born even if it doesn't happen the way that it did before.
It not as likely but I really want Tom to get his chance.
Please consider me as an alternative to suicide