Ya you have at least 3 popular actors established already and they're all the first incarnation (like the cinematic Keaton, Carter, Reeves etc), why'd you finish them off and cast new ones, get compared and hated on initially, AND you still don't know if the newbies will have success as good as the previous 3?
It's such a low risk play if they stick with the established 3 characters, e.g. the actress/director that made the 1st ever WW and beloved superheroine film, the actor that stunned the world and made the joke character into a billion dollar franchise etc.....team them up with hopefully the successful Pattinson, new Batgirl, Supergirl etc....
IDW if it's true or not, but WW84 allegedly has some ramification to the universe...maybe that could be their play to ensure the pathway to their Endgame in 5-10 years??
The general audience really really don't give a F about continuity, Marvel changed Hulk, who cared? Get JJ to make a billion dollar Superman movie, everyone will be like F Cavill and let's team him up with RP and Gal etc....
X-men did fine they didn't need to recast Hugh Jackman to align the universe etc...
I haven't read the source but I guess this is from Mark Hughes? He still added the "everything's evolving" line to keep the door open and prevent a blow up Umberto style