Well that sucks!
Though the tour's rep says the decision was mutual and amicable, Wisin Y Yandel seem pretty broken-hearted over it!
"It is with sadness and regret that we have decided to withdraw from the tour. Our sincerest apologies go out to our fans. We wish Jennifer and Enrique, as well as the tour, the very best. We promise to do our best to announce an upcoming U.S. tour in the very near future as we are as eager to be out there performing for our fans as they are to see us."
Apparently there were a lot of timing issues — including how long their act could be.
Welp! Sometimes it's better to do your own thing than be a third wheel, that's for sure! Best of luck!!