Economics professor at the University of Johannesburg, Fiona Tregenna, says the president made the right choice in accepting Nene's resignation.
Nene's resignation came the week after he admitted to an anti-graft inquiry that he met members of the Gupta family at their home six times, contradicting statements in a 2016 interview that he only encountered them at public events.
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Rossouw, a former Reserve Bank economist, worked with Mboweni during his term as governor.
In December 2015, Zuma fired Nene and replaced him with little unknown ANC MP Des van Rooyen.
Business Day newspaper said the minister made the request after acknowledging in a hearing that he had visited the Gupta family, friends of former leader Jacob Zuma accused of unfairly winning state contracts.
According to Ramaphosa, the former finance minister said there was a "risk that the developments around his testimony" to the commission would detract from the important task of serving the people of South Africa, especially as government is working to reestablish public trust.
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The crisis over the finance minister had thrown a spotlight on Ramaphosa's promise to crack down on corruption and boost economic growth. He is the kind of person who will be able to take those decisions.
"It is indeed a measure of Nene's character and his commitment of the national interest of our country that he has taken it upon himself to resign, even though he has not been implicated in wrongdoing", said Ramaphosa.
The rand gained 0.9 percent to 14.71 per dollar by 5:25 pm in Johannesburg, reversing an earlier decline of as much as 1.4 percent on the news.
Nene, speaking under oath at the hearings, also said that his then deputy Mcebisi Jonas was offered his job after Nene refused to back the nuclear proposals.
Both the Guptas and Mr Zuma deny the allegations.
Announcing Nene's resignation on Tuesday, Ramaphosa said there had been for the past few days "quite a lot of discussion" that had arisen from Nene's testimony at the state capture commission.
South Africa, Africa's most advanced economy, slipped into recession in the second quarter of this year, and suffers a stubbornly high unemployment of about 28 percent. His appointment "will help to ensure stability and consistency in policy direction", especially with the mid-term budget due to be released on October 24, he said.