Let's say people stream for 4 hours a day on average.
4 * 60 = 240 minutes
Let's say a song is 3 minutes.
240 / 3 = 80 streams == 80p/day
80p * 30 days per month = 2400p
2400p == £24
So that would be ~2.4x increase in price for end users without including Spotify cut or taxes.
Doesn't seem possible to me.