GPUs are so widespread that you should seek out a GPU if you want graphics
Tangentially, my own armchair speculation:
I think the epiphany architecture could serve a good purpose in a graphics pipeline for vertex & geometry processing, if wired up correctly in an SoC. (e.g. think of tessellation & transformations). it could also handle most 'GPGPU' type roles better (e.g. GPUs are used to accelerate game physics).
My 'dream system' might be a cpu, e-cores in the middle, and GPU cores, all with on chip communication. The PS3 CELL was supposed to be like this, but in the end it didn't pan out because they clumsily retrofitted a traditional GPU without on-chip communication (making the potential vertex-processing power of the SPUs clumsy to use, requiring communication via main memory).
I'd be curious to know what kind of enhancements the latest Epiphany 5 has toward machine-learning (I think it has 64bit registers and 2x32bit Float SIMD ?) If it has further reduced-bit arithmetic SIMD capability (e.g. 8x8bit in one 16bit register) maybe it could better suit vision and graphics applications ..