although this possibility is low and probably won't happen. but I want to ask you. if the bear market starts next month, and bitcoin falls below 20k. which altcoins were still able to survive and which altcoins are feeling the big impact of the bear trend.
we exclude stablecoins, because after all the market situation this coin will definitely be stable.
so I think Ethereum can still survive and that Ripple will be one of the biggest impact altcoins during the bear market.
The chances are very thin that BTC will fall below 20K but you never know this is crypto space any thing can happen any time,. All technical gurus believe that BTC will stay above 50K and strong possibility exists that it might hit 70K during 2021. As long as BTC stays above 50K, the alts will continue performing. I think Polkadot, ADA, LINK and LTC are good projects and they have not shown their real colour as yet. We might see good rally in these alts in coming weeks and months.
At the current situation it could be slim, but basing on the history, that is so possible as bear market could make the price go dump further. BTC dropped $3,000 if people still remember during the last bear market, so $20k from $60 or $70 if btc achieve it is not impossible, not even thin as you were saying.