[Elsie]

I think those raw simple molecules would very likely form more and more stable complex precursor molecules given long eons of time and immense numbers of interactions with immense numbers of other molecules.

More time; eh?

I think they won't.

[rustbucket]

[Me]:

I think those raw simple molecules would very likely form more and more stable complex precursor molecules given long eons of time and immense numbers of interactions with immense numbers of other molecules.

[You]:

More time; eh?

I think they won't.

Here is a little tutorial on how amino acids interact with each other to form chains of amino acids. i.e., proteins: Chemistry of amino acids and protein structure - scroll down to see the whole thing

And this might help: Amino acids linked by peptide bonds

Amino acids can form from simple molecules under the right conditions. They have even been detected in space.