I've been getting by on fantasy for pretty much my whole life, so if I had a partner that wasn't ticklish or wasn't willing to indulge, it wouldn't be that big a deal for me. I'd just keep on fantasizing. There are far more important things in a relationship than the mere realization of a fetish, after all.
That said, if I did have a partner who was ticklish and willing to indulge... >;3