For those disregarding TKD as a ineffective style, look to Cung Le's fights. He uses alot of TKD in his fights and he is very effective with it. You just have to realize that mixing it up instead of sticking to one discipline is the way to go.
So in my opinion, i would say go ahead and stick with the TKD as it is effective it just isnt used as much in MMA or isnt used correctly so people are quick to say it is ineffective.
pointing to one or two examples is insufficent, you need a fair number of people using the style otherwise it's more about THEM then the STYLE itself being useful.