Walk me thru this please...

I own a 2 year old Oppo 205 used for Disc playback, DVD watching and thumb drive music playing.
I am considering buying the Innuos Zenith 1 or 2 TB Streamer. 

Here is where  I need to know what to know:

What will I give up if I sell the Oppo and replace it with the streamer?

Playing DVD movies is one.

Others?

Thanks in advance for your contributions!