In theory with the right motors / right voltages / right torques, you probably could run a hundred motors on an A4988. They would not run very fast or turn very hard at all.
The idea on a Delta usually is to go mighty fast. That's going to take torque to speed up / slow down. Next up would be that they often use high current motors (for what ever reason). That's the wrong motor if you are going to parallel a bunch of them up. You want to start with low current motors.
Best approach is likely a compromise. Get some 0.5A motors and run them at 1/2 current. Put a 32V supply on your control board and a fan on it. See how far you can go.
The idea on a Delta usually is to go mighty fast. That's going to take torque to speed up / slow down. Next up would be that they often use high current motors (for what ever reason). That's the wrong motor if you are going to parallel a bunch of them up. You want to start with low current motors.
Best approach is likely a compromise. Get some 0.5A motors and run them at 1/2 current. Put a 32V supply on your control board and a fan on it. See how far you can go.