I agree that a more well known name would be better for marketing.
But Tennent and Smith and Capaldi have moved on, and Eccleston doesn't really want to return for assorted reasons.
I still would like to see Sean Pertwee take up the role of the Doctor but he doesn't want to be in his father's shadow and I respect that.
But the name Pertwee I would think would draw some fans back.
Or the son or grandson of a previous Doctor like Troughton or Baker.
But the BBC clearly wants to check the boxes as you say.
Now that being said, this new Doctor could be the diamond in the garbage that the franchise now is and revitalize it. Depends on the writing though.
Perhaps they should kick off the new series with a multi-Doctor story and have 14 team with 10 and 11. A brief return of Tennant and Smith could get things moving then see if 14 can fly solo.
Russel has said categorically this isn't about 'box ticking', he was the best actor suited for the role.