This article questions whether we need a new show with Stewart as Picard, who's the audience for it, and if this is just a way to placate white fans who can't stand Discovery:
New 'Star Trek' reboot starring Patrick Stewart is CBS' latest All Access offering. But who's the audience?
Personally, I too wonder why this is happening, especially considering how many fans (and the actor in question who portrays said character) wanted (and expected) a show about Captain Hikaru Sulu to be made, yet nobody could do so. And why does Stewart want this now when he said he was tired of Captain Picard originally?
Everything you need to know about this ridiculous false controversy clickbait article is encapsulated in the following two lines:
But it also represents a retreat by CBS from the progressivism of its first series on All Access, “Star Trek: Discovery.”
Though there are no public scripts as yet...
So, "we know nothing about the show beyond it starring Patrick Stewart and the setting being 20 years after
Nemesis, but we're going to assume that it represents a retreat from progressive values for... reasons." This despite going into detail about Stewart's own progressivism in the same article and saying they know nothing about the demographics of the rest of the unknown cast yet, which can be every bit as diverse as Discovery for all we know given the new setting.
The reason this show features Stewart is that TNG is still by far the most popular Trek series in terms of ratings, and Picard the only character to come close to rivaling Kirk and Spock in terms of being known to casual or even non-fans. Stewart has also managed to remain popular in the genre playing Professor Xavier and has maintained a strong presence on TV and in social media, and
Logan has shown the potential dramatic appeal of portraying an older and more vulnerable version of one of his beloved characters, which they may be playing upon here with Picard, considering this would be approaching his
All Good Things... age. Not saying they have to give him full space Alzheimer's again, just that they'll likely explore how aging has affected him.
And besides the casting diversity and certain (over)reactive fans who complain about SJWs, Discovery was unfortunately not even that progressive in tone or subject matter (at least not in most of the first season), with TNG being far more progressive in nature, IMO. So casting is not remotely the only determinanation of how progressive or not a show is, though they should absolutely strive for greater diversity wherever possible. But just happening to feature a white male lead who is one of the most popular characters in the franchise does not necessarily mean a retreat from that policy of diverse casting for the rest of the show. More diverse casting also doesn't mean you can't ever use a white male lead in a show again, especially when you are launching multiple Trek shows to build up your streaming channel.