Interesting thought...but I read it differently than you. Here's the verse you quoted:
19 I call heaven and earth to witness against you today, that I have set before you life and death, blessing and curse. Therefore choose life, that you and your offspring may live, 20 loving the Lord your God, obeying his voice and holding fast to him, for he is your life and length of days, that you may dwell in the land that the Lord swore to your fathers, to Abraham, to Isaac, and to Jacob, to give them.”
The word choose is used, but the choice God presents is similar to the choice presented in a shotgun marriage arrangement...hehe... It's either do as he says, or die, and if you choose life, that includes obeying him. Again, not a great testament to freewill. And, had they chosen death, what would that have said about God's plan? Was it thwarted? Are we, as humans, that powerful? Or, would we say "Well, that was God's plan all along", in which case did they choose death, or was it predetermined?
I feel like it's one or the other...what's the third option I'm missing?
I disagree that predetermination undermines God's wisdom. If you can control millions of people over hundreds of thousands of years to come to a specific, desired, result, I think you get to put Wisdom on the resume...