But even so the main problem i see is even let say tomorrow there is a real organic demand as a currency based on a sustainable economic value, then the price is going to rise, the hoarder are going to cash out and crash the price.
I don't really see this danger.
First, there are many hoarders, all with their own entry point and "desired ROI". Many of the early adopters from 2010/11 already should have cashed out 90%+ of their holdings. So there are always some cashing out, some buying in.
Now imagine adoption grows further and further. While some will cash out "the traditional way" on the way upwards, there will be many who will prefer holding. Or even better: trading their BTC to goods like houses, cars, gold and so on. If there is enough adoption, then this will not hurt the price: it will strengthen BTC as a currency even more as it will begin to really circulate.
One advantage even for holders who absolutely don't give a f* about Bitcoin adoption which could bring them to "cash out" buying things directly with BTC (and thus, strenghten the "currency" aspect) is that there may be less (or none, like now) KYC/AML measures than if they cash out via an exchange.
And I bet that only a minority would cash out everything, most will cash out, let's say, 50-70% of their holdings at each major price mark - e.g. 100K, "gold parity" (400-500K), 1 million. (I personally don't know if Bitcoin can reach a million USD, but gold parity should be doable.)
A world with real Bitcoin adoption would be very different from now when nobody really knows if Bitcoin really catches on and 30-50% crashes are possible so many are tempted to rapidly take profits after a big price increase because value could "go to zero". In a "Bitcoin adoption" world, in contrast, there a lot of "real value" involved, a large ecosystem of businesses working with Bitcoin, so it's out of the question that Bitcoin "will fail". There would be probably even entities and persons backing the price in some way, for example merchants who are benefitted by Bitcoin adoption could offer fixed prices in BTC.
And then you are still going to have the crazy price / sentiment roller coaster of people seeing this as an investement mostly depending on hype campaign and techno babble, price manipulation, bubbles and bursts and only wanting more of this. Waiting some third world country to crash their economy and adopt bitcoin to cash out their profits.
I think these phenomena are temporary. Ethereum managed to survive the ICO scam wave of 2017/18, which was really bad and investors were very naive. The 2021 "Gamestop/Elon Musk wave" is perhaps different because no real scam is involved, but it also will lead to many naive investors broke, which will be much more careful in the future. With each of these waves, investors mature, and are increasingly less prone to put their money in an ultra-risky gamble. This also will help stabilize the price.
And lightning network or any scaling solution is not going to solve this.
Like I already wrote, Lightning is only one of many tools which could lead to more merchant and "usage as a currency" adoption. It won't affect the "technobabble" guys at all, it's a different user group which will grow independently of it. So while it's true that "Lightning will not solve it", the macro-trend of more currency usage will eventually solve it, if it continues.
Of course, Bitcoin can fail on the path to adoption, but I'm optimistic, and the Bitcoin community can also help to not let it fail, promoting long-term thinking and discouraging the "gamble" mentality a bit.
@franky1: Please don't derail, I won't discuss Lightning advantages/disadvantages here. There are many other threads for that, thanks.