Jen had a very good idea during her first outburst
She said something along the lines of "why don't you have a little camera so you can see that line call"
Video refs? Other sports have them, why not tennis??
It would cut down on crappy calls and would make the game fairer.
Downside, it would take up time. But if the commentators have the luxury of replays and slo-mos why shouldn't the umpire?
and where they produce desolation, they call it peace