Based on your initial question, the two are clearly distinguishable. However, your example is not one that represents your thoughts well (unless I'm clearly missing your point).
"I would/wouldn't xxxx if yyyy," is different than, "I will/won't xxxx when yyyy."
The first statement represents a hypothetical situation regarding a possible reaction from a possible future action (e.g., "last two people on earth"). The second statement represents a guaranteed reaction based on a guaranteed future action.
Put another way: "Will" is used to talk about definite future actions. "Would" is used to talk about preferences.
Way to make me all philosophical-like on a Friday night, BTW...
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