Lol are older women not allowed to act alongside younger women for fear of being compared? And are older actresses not allowed to be seen once they age out of being a sex symbol? It's not like they're gonna put her in the Wonder Woman outfit...
I think the way Asteria was introduced pretty clearly set up a major role for her in the sequel that isn't just nostalgia/fan service. She was alluded to throughout WW84 and she's the only other Amazon that we know of in Man's World, so she's 100% going to be the lynchpin of Diana getting back to Themyscira and that's exactly what I want out of the sequel. The TV show was way before my time so I've got no strong attachment to Lynda Carter (other than her being chill, funny, and very pro-LGBTQ+ on Twitter), but if 71-year-old Michael Keaton can play Batman again I'm not sure why she can't come back and play an Amazon.
Also I can't believe anyone actually thinks Hal Jordan is gonna be in the movie. Patty Jenkins is notoriously clueless about comics, there's pretty much no chance she even knows who Hal is. But if we're putting stock in unreliable "scoopers," there was another "leak" that said it's gonna be about Diana, Asteria, and Donna Troy on a quest to find Zeus' lightning bolt and use it against Circe and if that one's true I'll be VERY happy.