Of course it would. Because many people have to prioritise games due to cost. A game, albeit a Semi Final against Burton, no disrespect to them, it was always likely to be a stroll with the outcome a given. Not so much had it been Spuds/Chelsea, so maybe the Rotherham game would have took a hit had we drawn either of those two?
Ticket prices may have been lower than usual, but travel/petrol and other costs remain the same. Not everyone is lucky and can afford every game, especially so many in a short length of time right after the expense of Christmas. Simple economics, not poor support.