there are multiple benefits of DTUBE over youtube yes... but lets also now see some disadvantages.
these can be listed only by some one who has actively uploaded vids in youtube and Dtube.

1. Youtube loading time is much less also if there is ever any problem while video is beeing uploaded, when you refresh or restart the upload procedure , the loading starts from where it had stopped. This is not the case in Dtube. even if you refresh or some problem occurs at very last moment you will need to upload entire video again. The time it consumes is massive so big videos cant be uploaded that easily.
2. Its difficult to bring your audience base to a new platform that easily. lets face it every famous Youtuber has massive competition , its very normal for its audience to simply switch to the competition rather than switch to Dtube.
3. Dtube interface is far inferior to Youtube at this point...and needs loads of work.
4. Mobile viewing is the key for success of Youtube... another place where Dtube is way behind Youtube.
5. Monetisation model of Dtube is yet to be established , time will tell if it can sustain the model it choosess.

So yes future may be bright for Dtube, but it would need hardware and dedicated development and support to be any where close to Youtube!