DRUK
For an experienced and competent display pilot, no. He/she should have considered options to follow for missing a gate and have planned alternatives in order to continue the display. A display is an exhibition to spectators and a display pilot should be able to fill the planned 'exhibition' slot if he can do so safely. Most military displays do require a termination if a manoeuvre cannot be flown as planned, but with the exception of RAFAT, BBMF, RNHF etc most military display pilots only fly 1 or 2 seasons and so may not have developed the capacity to substitute alternative manoeuvres, and hence they also have a large training and currency requirement.
For some very light and slow aircraft, the display must be varied according to the wind and often that can only be judged fully once airborne.