Sure, why not. Theatre guys are more open to this stuff.

But practically, things are taken one step at a time. Just because the performers are comfortable with it, it does not mean that audiences will flock to see it.

Then again, theatre folks can be more elitist than you imagine. Cynthia Erivo is not new to the West End. Great voice. I think back then she took on traditionally black women roles. Not sure if she can pull off dracula though lol.

Edit: Nick Jonas also tried to be Marius in Les Mis, dude was nearly eaten alive by the others. It is one thing to expand your roles and not be typecast, but it doesn't mean that guys like Rowan Atkinson can become the Itallan Stallion after putting on some boxing gloves.