I don’t think it will be. Diana had stratospherically good press during and after her lifetime. She was good looking, vulnerable, relatable (oddly - she showed “nice” and acceptable human failings; even her bulimia - because she was so attractive - garnered her good press in a “Charles drove me to it” way, unimaginable today), and had a track record of proven good deeds. She made everyone else in the RF look dowdy, but she always kept herself second to the Queen, as she was per the rules of the family she chose to marry into. She genuinely believed in the hierarchy. Some people saw through the front, but there was undeniably something of substance there.
When Meghan first appeared on the scene, she made Kate and William look frumpy and middle aged. Quite dull. She had, relative to them, glamour and the cameras loved her. This I think is why they both thought they were level with HMQ, and why they like to believe all they’ve been told about Meghan being Diana 2.0. They saw the press attention and it brought everything back for him. That star quality. Diana could have tanked the Queen, in her day, and H&M took the line they were fed (by people who sought and still seek to make money off of them, people who Meghan thinks she has the whip smart intellect and all the necessary experience to handle and best) that they could too because they were just as glamorous. But, they’ve proven themselves to be entirely lacking in substance. It’s not to do with intelligence (Diana was notoriously lacking in that front). It’s more the softer skills of empathy, humility, curiosity, caring, genuine concern. In his way, Harry does still demonstrate this at times. You can’t deny his interest in wounded veterans and his commitment to WellChild. But in Meghan he’s found someone for whom all this is in service to a greater good which isn’t the people or those less fortunate; it’s herself.
So, I don’t think Harry’s version will be blindly accepted. He doesn’t have the benefit of doubt. In fact, through his choice of spouse and his acts since, he’s lost any benefit he had and accumulated worse. He’s shown himself to be the tin man, with his wife as the wizard of oz.