The only people who are hurting are the ones who bought the GTX 1070/1080/1080ti. Most people who bought AMD probably came out ahead, even if they bought the GPUs late. As long as you paid MSRP for the AMD GPUs you should be fine.
However those you bought the 1080Ti for $700, with a current daily profit of $3/day you really should just return those GPUs back to the retailer for a refund.
Haha, not really, buying more 1080 Ti.
If you can explain to me why you think a 1080 Ti is a wise investment please let me know? Maybe I suck at math but
One RX 470/570 is ~$200 and makes $2.30/day
One 1080Ti is $700 and makes $3/day.
If you're mining ETH on a 1080ti you're stupid - and making a LOT less than the card is capable of if you mine stuff it's EFFICIENT at.
There are quite a few algos that a 1080ti manages twice OR MORE the hashrate of a RX series card - the algo ZEC uses is the best known, but the 1080 ti also is very very good at groetsl, skein, lbry, lyra2rev2, just for the algos I've personally tried mine on and can compare with my RX 470s.
Also, finding RX 470/570/480/580 at under $400 the last 2 months has been a rare thing, even if you manage to sneak in on a Newegg restock it's "limit 1 per 48 hours" WHEN they have them and more like $250 - and other retailers have the same sort of limit when they have any at all.
They're also NOT making $2.30 a day any more, even if you BIOS flash them and overclock them enough to nearly match the hashrate of my R9 290 cards - as of RIGHT NOW they're grossing a hair less than $2 (though probably netting a hair more than my R9 290s due to much lower electric use) even if they CAN get to the 29 Mhash/s my R9 290s manage.
That 1080 ti also will retain it's resale value after the crash - the RX series cards will probably be selling for a LOT less than MSRP 'cause of oversupply.
I'm not saying the RX cards are bad - I'm just saying that for the last 2-3 months calling them a "$200 card" has been generally a LIE - and will remain a lie for most folks 'till the current gouge pricing goes away.
You also have to factor in that the total SYSTEM cost is going to be a good bit higher per card, as you need more RX series cards to match the income of GTX 1080ti cards therefore you need more rigs (and more MB/CPU/RAM/HD/PS etc).
4 months ago, the RX were a very very good and often the best mining option - but at recent gouge pricing it's a lot more of a question mark - and when ETH moves to PoS it's going to kill the biggest coin that the RX series EVER had a major advantage on.
The 1080ti isn't 2x a 1070 on anything that I am aware of.
The 1080 ti will generally use a little less power for 2 of them at slightly higher hashrate vs 3 1070 cards when doing the SAME algo even at the SYSTEM level.