Sure the prices may go down a bit more, but right now is the time to be thinking of buying coins. For less than the price of that used GPU ~$120 you can now buy a whole Ethereum coin, which would take you over one year to mine with the used GPU. I expect in the near future you may be able to pick up close to 2 ETH for that $120, so then would definitely be the time to jump in.
The super low coin prices will seem like everything is over but in reality they will represent the time of maximal opportunity. Opportunity that is for investing in coins directly, not in mining.
eth issuance will be reduced to 2 eth from 3 eth per block which in turn is 33% less profit which in turn means any eth you buy right now will be 33% more valuable when the market starts to rise again. Prices will rise so fast, manipulators are using this to buy cheap coins, they did this in 2015 and now they are doing it again. In 2015 it lasted 3 months, this time I think will last 3 to 6 weeks, want to profit huge? sell anything you have and buy eth, wait a month and then you sell, 100% profit guaranteed and possible 300% cause when the same manipulators start buying again then it will be late for normal people to buy cheap coins again. You have to buy fast right now, wait any longer and you will lose an opportunity of a lifetime.