Extremely difficult understanding your question, do not understand your thinking on the “likely looseness of the small blind”
I have rarely seen any small blind become extremely loose because he was in a small blind position, actually just the opposite is what mostly always happens.
As far as becoming too loose because ½ of my obligated chips are already in the pot, so it is not much more to see the flop.
Well, if every other player who decided to join the pot did not raise the blinds, then probably yes, but it would also depend on a couple of factors, whether my hand was total junk, [meaning the chances of it ever being successful in a multi-player pot] and what size my chip count was vs what size the blinds were with my rag hand.