I don't really like polo shirts, but I'm all for getting rid of ties.
The old Virgin uniform with jumpers seemed to be a good strike between casual but professional looking.
Pretty much agree with this. Wore a polo once on a non uniform charity themed day and felt under dressed and self conscious the whole day. Probably because I wasn't use to it though.
I do think ties should be dropped. As others have said, many in the business community don't wear them now. They are not needed even to be company directors. So why the need? A shirt with the button open, trousers and nice jumper should be perfectly smart enough.
Comfort needs to be considered too. Fair enough clip on ties prevent people being grabbed by a tie but you need your top button done up whilst a ladies scarf doesn't require that. Many opt for a wrap around tie just so the top button can be undone. Then in the summer it's do you don't you? Some places would rather you wear them on all but the most humid of days, others where they aren't worn at all in June July or August. And if everyone else keeps wearing them there's more pressure not to take yours off even if you're uncomfortable.
There's also the weekend when a tie is generally far too overdressed for the weekend leisure customer who will probably be in a t shirt or open shirt and jeans. So I don't think they'd judge no suit as being inadequate whilst dressing casual themselves.
Definitely better just to remove them from the outfit imo, and save on a little bit of money too.