Blockchain is largely usesless technology, nobody wants slow expensive databases. However, they are very very good at one things, which is creating a censorship resistant network.
BTC will be never be used as a currency, there are less retailers accepting it now than 5 years ago.
Crypto currencies are basically speculative assets, but it is the fasting growing asset class of all time and truly is the only chance to 'make it'
putting your savings into an ISA or a tracking fund you may get 10-20% APY if you are lucky, otherwise you will barely beat the insane inflation that is going on right now.
Crypto is volatile and the ups and downs are crazy, but if you can make the right investments and hold them over time you are likely to make huge huge gains. Just look at BTC and ETH with 6million X and 500,000 X gains from one dollar.
For everyone saying 'but how do you cash it out' its actually very easy to convert to fiat, then you pay 20% CGT just like if you sold shares in a company.