If it is about securing the future, then without doubt it is the safest way to enjoy the future. What we save today will surely help us in the future.
I can agree that investing in crypto is the way to help our financial strength in the future. But I don't think it is the safest way, investing in crypto has a high risk, no one knows what to happen to crypto investment in the future. That's why we don't invest all our money in crypto, just use the money that we can afford to lose. Put all money in crypto investment isn't the right way to secure our future.
I, somewhat agree that cryptocurrency will help our lives in the future. But, it will depend if you have invested in the right crypto and if it's good for a long-term investment. And, I think that we also need to secure our assets and invest in the right hardware wallet since as we know that software wallet can be hacked anytime if you just mistakenly downloaded an app that has spyware or virus on it.
Also, It's really safe to invest in crypto if you have bought on the right exchange that has insurance funds.