In praise of Wagamamma

That's my point in one line.

Sure, but my point is related to this comment:

they'd prefer you to drink up and move on (see Busaba) so they can sell someone else a coffee.

Some loafer stretching out his coffee is only a very small marginal cost to the coffee shop, since you don't need to sit down to buy a coffee - most customers takeaway. Once the company is paying the rent for the seating area, they won't give a toss how long customers loaf for.