Full time employees will now cost much more to the employer: taxes, health care, benefits, a higher wage (the wage of a waiter is usually much lower than the standard minimum wage).
All these costs add up and the result will be a much higher end cost for your meals. Restaurants usually have razor thin margins as it is...if they even make it past their first couple of years in business.
Again, I feel like most people complain about the wages, but will then complain about the meal costs when they go up because they misunderstand the costs in running a business.
I know many waiters and waitresses and most make way more in tips than they would ever get if they were paid an average wage.
I think if you talked to most waiters/waitresses, they would want to keep the tipping system.