How Many Times Can You Replace Porcelain Veneers?

Veneers need to be bonded properly to enamel to ensure longevity. Also your bite needs to be properly adjust so that you do not grind or bite on the veneers with excessive bite pressure.

If there is limited amounts of enamel then I agree that crowns might be a better option.

Your original veneer experience is what you should expect.  The most common cause of veneer failure is chipping or breaking.  Having the restorations coming off should be very rare with proper preparation of the tooth, proper bite adjustment, and excellent adhesive techniques.  To me it is more semantics between veneer or crown.  I use the same porcelain material for both and conserve as much tooth structure as possible without compromising the final result.