Well, possibly - but the point is that while ubiquitous safe seats are obviously detrimental, so is their elimination at all costs. The problem with safe seats isn't that popular politicians are consistently elected; it's that minority voices in those constituencies are marginalised. You can certainly address the latter by preventing the former, but it's a far from ideal way of doing so.
Och yes, I don't think I'd be quite so cavalier about my advocacy of this particular voting system if there was any chance of it actually being used.
(A bit like the one time I voted for the Scottish Socialist Party - I only did so for their entertainment value, not because they would have any likely control over policies).
(Edited for ghastly sentence construction, sorry)