Yes, it might be a hard job, but it’s not an artistic or creative task. It’s something a robot could be programmed to do and would be better at it. That’s not the kind of thing I believe deserves a tip. It’s like tipping your mailman for delivering the mail on time or your checkout girl for getting the items quickly through checkout. Some do it quicker than others, but that’s part of the job description. I think the structure of giving them a direct salary without the tip option makes more sense.
They won’t make as much and therefore will look elsewhere for jobs that are less demanding. And as restaurant costs will go up, so will pricing. Prepare for European restaurant pricing. You won’t be pleased. And you will enjoy eating out far less frequently, unless you’re a 1%...;-)