Did anyone notice that Falion, the guy that cures your Vampirism, says he's spoken with Dwemer?
Last, but certainly not least, we have http://www.uesp.net/wiki/Skyrim:Falion, who claims he's seen Dwemer. Being a Redguard, it seems out of the question that he could possibly have been alive during their time, Telvanni magics included. Perhaps he's referring to Yagrum Bagarn? Perhaps he merely meant he saw a Dwemer Spectre. Or perhaps the Dwemer still exist somewhere, or there's just one more Deep Elf still roaming around somewhere. A very heavy claim that, unfortunately, we get no more information about.
;)
Really, it was that line that made me post this thread. I had seen the other three "points" I had mentioned in the original post before and brushed them off, but that was the last straw. I knew I wanted to start a discussion about this, as I can't help but feel that Bethesda considers the Dwemer still accessible in some way, at least.