Nothing happens op because first of all . The decline has a limitation . It can't just decline forever but declines can be a good and bad depending on the persons view .
That is an optimistic point of view that the price wont decline to a certain point but consider one thing, anything that has a valuation need to have a real world application to have an valuation and if that is not fulfilled then the market will drop down to zero and i doubt whether it can survive the next ten years because of the use case situation.
I also can not expect much for the next 10 years, if prices continue as they are today people can choose other investments. hope crypto gets better soon, because altcoin prices in particular haven't improved. it might make people move to invest