The practice is worth less without you in it.
The practice has been built around you. Patients come for you. Referring providers send to you. The brand is your brand, the relationships are your relationships, the reputation is your reputation. That's how most successful practices get built.
The problem is that none of it transfers. The day you step back, the practice's value steps back with you.
More patient acquisition won't fix this. Filling the schedule with new patients deepens the dependency, it doesn't break it.