Sell your GPUs now, in 1-2 weeks they will become more worthless as they are now.
They can always be sold for their original, intended purpose. As gamer video cards.
Like the other 10000 280X on egay for 100$ each card? Sure.
There are no 280x's on eBay for $100. So, you are just trying to predict the future. Poorly.
After all that's what people said about block miners too. SELL! Worthless in weeks! Yet they still sell TODAY for more than half what they cost.
95% of the world knows nothing of crypto-currency. When they do, they will want in. Just like the people buying blockminers today.
Besides you are assuming that the majority of GPU's sold are for miners and when the difficulty rises there will be some glut of cards and drive the price down. Simply not true. If miners bought the majority of cards we would we would see purpose built, dedicated ASI mining cards marketed to miners. Yet, we don't. Everything ad and card is about gaming. Know why? Not a big enough market or
they would exist. Truth.
You sell all your gear and go away. Get out now and break even or with a small profit. I'll keep mining, save my coins for the inevitable price rise and retire.
Thanks for playing.