Every bit per second that a WAN connection is slower than a CPU interconnect is too slow and that's only half hyperbole.
But I'm a realist so I'll take what I can get.
As your remote resources get faster and faster you start using them more like local resources, which can change (often for the better) how you do things.
If all you're doing is watching netflix then 25mbps per user is probably fine.
If you're working or creating or earning, then you want your connection to be as fast as possible, your distant end to be as fast as possible, and the hardware in between to be fast as possible.
But I'm a realist so I'll take what I can get.
As your remote resources get faster and faster you start using them more like local resources, which can change (often for the better) how you do things.
If all you're doing is watching netflix then 25mbps per user is probably fine.
If you're working or creating or earning, then you want your connection to be as fast as possible, your distant end to be as fast as possible, and the hardware in between to be fast as possible.