Well, the conclusion should read not "more things" but "at least as many". Things might accidentally not exist.
I feel the fact that you reject premise 1 just means that you don't really grasp the concept of impossibility, logical or otherwise... Or you have a different concept of existence.
The reason why I used a semi-formal notation was to suggest that if you formalise it all, you can actually prove "P(x doesn't exist) ≥ P(x is impossible)" as a tautology. (Ignoring the issue that with specifically logical impossibility, you get into a bit of trouble with probability assignments to tautologies.)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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