Rizla, I don't think the "land grab" is totally finished yet.. sure it's got to slow down at some point, but there's still a few indy ISPs left out there... not too many, but one or two..
And yes, funny you should say Zen, I was just thinking about that the other day. I'm surprised they've lasted this long. Probably because they charge a bit more than their competitors, and they have the Zen Partner programme, and (I believe) more business accounts than most other ISPs, etc, which are also buying them time.
Whilst I'd love to share your enthusiasm for quality rather than price-based competition... I can't see it happening for a while yet. Mass-market wholesale ADSL2+ should be a great time to start making prices a bit more realistic, but there will always be at least one (or a handful of) smart alec ISP (probably an Enta reseller or something!) who thinks they can make a quick buck by signing loads of people up on an unsustainable deal and then getting out before the brown stuff hits the fan.