Reliability of Bluetooth with Golds

[Mohmm]

Presently I drive my Stereo Golds via

MacMini 2014, Roon > optical > Dialog > Ethernet > Golds

I am wondering, if I remove the Dialog intermediate, I could theoretically connect my Mini by Bluetooth and remove the ethernet cables. Regarding this potential setup I have a few questions:

Is the classic version of Bluetooth (4) be able to transmit higher sampling rates than CD?
In your experience, how reliable is such a setup?
Will Bluetooth involve  a considerable loss of sound quality?

Thanks a lot for any answer.