If you want to run unusual tests/ games that need 6gb +memory then I'm sure you can catch a Ti out when it runs out of memory. Perhaps I was slightly over egging it to say that a 980ti can match a Titan X in most scenarios but its so close as to make the Titan X look pretty redundant for none 'extreme' multi GPU configurations.
980ti - 'All the power of the Titan X for £550'
'Titan X performance at a fraction of the price'
Frankly trying to make a point with a Kingpin card is ridiculous. Its a very high priced card targeted at people that don't know better, have more money than sense or are hard core enthusiasts who will be utilising the massive potential of the card from the VRM layout etc.
Stock 980Ti's are considerably cheaper than stock Titan X's. You have to contrive some fairly elaborate scenarios where in a single card setup a Titan X is anything more than a few percentage points ahead of a 980ti and SLI performance is rubbish anyway (I should know)
Face it Kapp there's always going to be a bit of buyers regret when you shell out £££ for the full fat front running Titan before Nvidia bring out the 97% percentage performance card for 60 - 70% of the price
Paying top dollar for a new Titan X now is hard to justify