My first reaction was good grief!
It sounds a great idea, having that support and one to one contact, but there is a cost involved and you'd still need to research the person to assess their experience to take on the role- and how do you decide whether they're good enough?
We know the writing world has changed so much in the past 10 years.
Self-publishing has lost most of the taint of vanity publishing, and serious writers going this route know they need to write the best story they can, produce a good manuscript and get an editor who knows what they're doing- and can prove it; along with a book cover designer-among the numerous items to tick off the self-publisher's list.
Numerous services for writers have emerged, and only the individual writer can decide what they think they might benefit from.
But consider the following first (and I'm referring to the UK here):
We already have: mentoring, critique groups, regional writing organisations (offering lots of choices for developing your writing skills and bringing your book to life), genre specific organisations (with conferences, local groups and numerous opportunities to network, even take part in agent 1 to 1's etc), podcasts, book festivals...
Then there's universities offering creative writing courses, and degrees.
Writing Magazine has been running their writing courses for many years.
Yes, even writers' groups and clubs; choose wisely and you'll find published writers who belong to them and will pass on advice, encouragement and help writers develop. Often, those writers were gifted with the generosity of their peers when they were first experiencing those qualms.
You can learn from any of these, with support and advice to develop the skills and resilience you need to produce that book, or other writing.
Of course there's a cost to all these things too, but you can mix and match as your needs - change.
Doulas may find their way into the vast world of writing services and opportunities, but when there's already so much available, are they really needed?
Do you have any thoughts on this topic?