It was lower than the previous worst attendance of 58,349 against Italy in 2002 when Wales were in another losing streak.
The cost of a match-day experience in Cardiff has been suggested as the reason for some fans staying away.
But the political turmoil in the domestic game, with the WRU looking to cut one region while facing a potential vote of no confidence among member clubs, is leaving disgruntled fans to vote with their feet.
Tandy said: “Genuinely, we’ve got the best stadium and fans in the world. Even with limited numbers, when they get behind the team at the end, it does inspire the players.
“I understand there is lots going on and has been in Wales for a really long time, but want to unify everything.
“We’re a small nation, we need everything to be flowing in the right direction. I genuinely believe everyone needs to play their part in how we get there. There needs to be some patience to get change. It doesn’t happen overnight. “
