IIRC the case was about whether it was within the governor’s power to allow statewide mail-in voting. There was never a need to delay 3 months but even if they did I can’t imagine turnout wouldn’t have been better when it’s a matter of coloring a circle, closing the envelope, and dropping it in a mailbox vs standing in line for hours while risking infection during a global pandemic. That… is stunningly low turnout. Well, they got what they wanted: they successfully used a national disaster to suppress the urban vote, to achieve their goal of tilting the Wisconsin Supreme Court conservative. I guarantee that the conservative judge will win the seat, there’s no way he didn’t with ~3% turnout in Milwaukee instead of 33%.
The interesting part is that both parties agreed to hold the primary on time until about mid-March when Trump finally began to acknowledge the pandemic risk and other states started rescheduling their primaries. Once the governor asked the legislature to send everyone a mail-in ballot Republicans began making unsubstantiated claims about voter fraud and claiming absentee ballots couldn’t possibly be made ready in time. Maybe slip it a week to accommodate and allow people to avoid getting sick?