The Gunners long-serving manager has come in for stern criticism in recent weeks.
The Frenchman has come in for increased criticism in recent weeks, after a number of disappointing results have seen them fall away in the title race.
The recent win over Hull City in the FA Cup saw some fans displaying a banner asking for the long serving boss to leave the club.
There are worries though that they could suffer as Manchester United have once Wenger leaves the club.
Merson disagrees though, saying whoever comes in as his replacement will not do worse than he has done.
“Whoever comes in, they will not do worse,” he told Soccer Saturday.
“People go on about Manchester United because they’ve had one bad season. But in that ten years when Arsenal haven’t won anything, they’ve won the league.”
“They go on about Chelsea too, but in that ten years they’ve won the Premier League and the Champions League.”
The problem for Arsenal is finding a manager of the right calibre to replace Wenger when he does eventually decide to leave.
Both Jurgen Klopp and Pep Guardiola would have been of the right standard, but they have already been taken by their Premier League rivals.
Carlo Ancelotti would have been ideal, but he is going to Bayern Munich, while Jose Mourinho seems destined for Manchester United.
That leaves the Gunners with very limited options, and there will definitely have to be extensive time spent on searching for the right man, regardless of what Merson says.