Awfully convenient that the etc. happened to be in brackets then. I guess the previous sentence ends at the etc. when I don't put it in quotes and after then if I do.
But you should always use "i.e." because it's an abbreviation for two words. And I can't even think of a case that you wouldn't follow it with a comma (i.e., "i.e.,"), so that doesn't conflict with the ". " end-of-sentence pattern.
There are many style guides[0] that treat i.e., e.g. and the other Latin abbreviations specially in always punctuating them - it's rather rare to find someone talking about the former U.S.S.R., T.C.P. packets, or N.A.S.A.'s missions to the I.S.S. - to all intents & purposes, ie is the exception, not the rule. It's worth pointing out that i.e. is exceptionally difficult to type on a lot of mobile devices.
If I may, I call your attention to the first of the two sentences endings in the quoted snippet.