From the history only ponzis are profitable in short holding and all other real potential based opportunities are proven to provide big returns in long term holding hence digital assets cannot be an exception here.
Yes; in my opinion as well, not just digital assets but each and every investment will be highly profitable in long run give that its fundamental are good in long run (and practically without stronger fundamental, you cannot expect an entity to be sustaining everywhere). So, if we want handsome returns from an asset then we should give it enough time.