In Australia we have had Friday Night Football (Aussie Rules, Rugby and Football) for decades and it is incredibly successful. Friday night football has been played for at least 30 years and is now the most popular television timeslot. It gets the biggest crowds and the biggest TV audience (conversely, in Australia Sat Arvo and Sun Arvo are the least popular TV time slots, which I believe is not the case in the UK?).
Pubs and bars are full, everyone watches the game then kick off the weekend by going out after, and away fans don't have to get up for work the next morning. In Australia it is the best timeslot for clubs to play as it allows them maximum exposure for sponsorship and TV/Ticket revenue. In Aussie Rules the bigger teams generally get most Friday Night slots as the TV networks are guaranteed big attendances and television ratings.
If they have the right matchups, the TV audiences will be huge not just in the UK but also around the world, as areas like Australia and Asia can get up and watch during breakfast time on a Saturday morning.
Do not be surprised if BT and Sky are fighting for the rights to Friday Night Football for the 2020 TV rights as their main priority ahead of the Sunday fixture.