TBH I'd rather Nikon hurry up and get something released, it would save me a lot of money
I probably will when the price comes down and there's more used lenses around. You never know though, by the time that happens Nikon might have released something.
A9 doesn't interest me tbh, my next 'upgrade' will be for a high res body. I would like to downsize and a high res body would allow me to use a lighter 100-400mm type lens and still give me the same effective reach as my 150-600mm on the D750. There's no doubt that as much as I love my Olly in an ideal world I'd love a FF body for travel, all this combined is the only reason I've even contemplated the A7 series. At the moment it's outside my reach price wise anyway so it's not something that I'm going to be able to do, just been considering long term options