ETH could fall below $100-$200 and it can take 2-3 years to reach back to $1000.
Back in November 05, 2017 the price of Ethereum dropped to $299 USD, however last December 31 Ethereum price goes up to $721 USD, that means if you bought 1 ETH last November 5, after 60 days the price of Ethereum doubled. If Ethereum can turn around the price in just 60 days, that $1,000 USD is very much reachable and you don't need to wait for a year.
You describe it correctly, 2x to 3x in few months is not that difficult if things goes fine. I think Etherum can cross $1000 in Q2-Q3 as it is widely used altcoin with a working product. Etherum played a very important role in the popularity of cryptocurrencies.