What actually we needing for now is the continuous support of the big companies (and might some others will come and join) and with these instances, we no longer to see the price of Bitcoin will get back dump below $10k.
Talking about possibilities you can't ignore anything, but realistically speaking I don't think we will see $10k again. The buying support will just be too strong from all directions. In fact a lot of people would wish for Bitcoin to go to 10k so that they can also have a chance to tap their toe in the crypto water. 10k at this point seems close to impossible for me.
it's true that 10k is an unrealistic price. there will definitely be a big wall preventing that from happening. even before the price reaches 20k, there will be a lot of people queuing to buy bitcoins. but regardless of how far bitcoin falls, it will still have an impact on altcoins later. and one thing that can not be avoided at this time, the down trend has started. so just pray, bitcoin can survive this pressure.
$20k would be an absolute critical psychological barrier because that was about the all time high we saw during the last bull run. If we break that I think that could cause a lot of panic because thus far we haven't fallen below former ATHs in the following bull run. I would say it would catch people by surprise if out of a sudden we fall below $20k, me included...