Display analyst firm DSCC posted an interested article stating that the latest range of bezel-less LCDs are very similar to the high-end flexible OLEDs in form (not in contrast or image quality), to the point that mid-smartphone makers find it hard to justify the extra cost of a flexible OLEDs. The following table graphs shows the current price gap between flexible OLEDs and LCDs:
Price of a smartphone flexible OLED vs rigid-OLED vs LCD (DSCC, Feb 2018)While a flexible OLED does enable a higher display-to-body ratio (82.9% on the iPhone X, for example), a high end LCD comes pretty close - the Oppo F5 reaches 78.1%.

DSCC shows SDC's current fab utilization rates, and you can see how its flexible OLED lines dropped from almost 100% utilization at the end of 2018 to around 45% today. Samsung's rigid OLED production also dropped from around 80% in September 2017 to 50% today.

SDC OLED fab utilization rates (2017 - Feb 2018, DSCC)

DSCC estimates that Samsung is facing a difficult challenge, as its flexible OLED sales are dependent on high-end modules, and is very dependent on Apple. It is not likely that flexible OLEDs will be adopted by smartphones that are not high-end flagships. DSCC sees the situation resolved in the second half of 2018, as Samsung is expected to lower the prices of its flexible OLEDs and achieve more design wins.