The Jury's out on the Plus 6 as far as I'm concerned. I agree that MMC must evolve but I also remember when Porsche tried to replace the ageing but iconic 911 with the 928 in the late 1970's.
The 928 won 'European car or the year' but it was a departure from principles that had made Porsche and the 911 great. In the end the 928, though technically superior and far more modern was shunned because the Porsche customers wanted a traditional 'flawed' 911 which had character and traditional rear engine format and the base price of the 928 was also much higher than the 911.
Would I buy a Plus 6? No I don't think so. If I had the £90K that the first editions are priced at, Id think I would keep my traditonal 4/4 and buy one of the Plus 6's competitors. A test drive in a Plus 6 could change that though!