People forget that E.R. existed. It's a shame that there were hardly any South Asian characters, particularly on one hour dramas in the wake of that show but my guess is that there was no will behind the scenes to see South Asians as more than stereotypes. By the way, that's not just true of South Asians but of most immigrant groups of color on U.S. television and movies, including Black immigrants. It's pretty darn pathetic. Like I said, probably one of the many reasons, soaps have failed to grow their viewing audience over decades.
To be honest, that could be a good reason for the drop off of viewers in primetime broadcast television as well. Why waste time with The Last Man Standing when you can go to Netflix and watch Narcos, House of Flowers, Kim's Convenience or watch sexy Dev Patel on Amazon Video or Korean dramas on Hulu? There's a whole diverse world out there and U.S. T.V. is pretty much missing it.