BTC can easily fall further till 7000, yes. There are a lot of bullish indicators on the daily chart already, but that does not mean that BTC will recover instantly.
We will see what the lightening network will do to the BTC price. If it was implemented in 2019 for common use, that would be too late.
ETH will become more interesting once again also with the Raiden network. It failed the krypto kitties test.
Basically each coin which really solves a problem has good chances of making it into 2020. And there are not that many.
When checking POW against POS coins a month ago, i found that POS coins decline in price compared to BTC. That might be because people regularly cash out their POS gains. POW coins rather compete BTC.
But basically POW makes no sense to me. What shall be the service of having demonstrated that a complicated problem was solved by burning lots of energy, which was no problem in the first place ? 10 or 20 years ago computing power was used for brute forcing problems like cancer research. That was useful POW.