Our descendants might have terrible lives for a thousand generations and it would be worth it if it means humanity can get to better times on the other side.
Would it be worth it? There is likely no net loss for the universe if we or even the entire Earth disappeared overnight and that might be better than thousands of generations suffering painfully over thousands of years.
*But no not necessarily, but at the same time I had a lack of autonomy in regards to those decision made.
I was questioning your assertion that centuries of "terrible lives" (which, to me, seems a regression for most) would be an acceptable price to pay for "better times" later on. Compared to the past 1000 years where life has, in the main, improved gradually generation after generation, I feel this assertion at least deserves to be questioned.
If you look at the history, every discovery was made due to very rare and specific combination of factors, and the only way to create such combinations is by trying many life paths in parallel.
Perhaps concentrating attention on two children makes it that much more likely that they will have longer, fulfilling lives, and grace us with their eventual wisdom, rather than all three grubbing in the rubble of a collapsed civilization.
Sure, the odds of either path don't change much based on the single decision of whether to have another child, but every little bit helps, right?