That's the case. I don't think Spotify had any impact on Samsung's decision. It's the case of Tizen. Only Android will be supported. End of story. So either we can use a chromecast or mirror the screen to our tvs.
Another option is to play music from your android device through bluetooth. My other home theather has BT, so that's how I listen to Spotify. Unfortunately my primary sound system and my living room TV do not support BT (well TV allegedly has BT but only for communication with the remote), but Spotify app was there. But now the only solution (workaround) I found is the mirroring (I don't know if all phones support this feature, since my 2 phones are Samsungs).
So now the turn have come to Samsung´s product Spotify close down buy not continue their suport of libspotify. My self have a Bang&Olufsen unit that used to have a superb spotify integration but due to Spotify´s decition to stop supporting/developing lib spotify they instead forced all their existing partners to stop the interaction to Spotify.
They want to have all interaction via their on app it seems but I think Spotify is dropping premium customers buy this, I don´t see a need to have / pay for spotify anymore due to this behavour from them.
Hey guess what Spotify? Due to your bleep-up I was just reimbursed 1/3 of what I paid for my now nearly 4-year old TV. According to law I could have gotten all of my money back and returned the sucker, but I decided to play nice and only asked to be given back an amount equal to what I had paid extra for a smart TV, compared to a lesser, cheaper, not-so-smart TV.
The electronics store acknowledged that the TV was no longer as advertised, and compensated me for it just like the law says they have to. Bet they love you now....