I agree with Rob but it all depends on demand and your definition of "liner".
With the popularity of cruising and the "don't need to be anywhere in a hurry" mentality hull shapes(the main characteristic of a liner - IMHO) will not migrate from modern cruise ship to a QE2 or QM2 "liner" design. In other words, the Blue Ribband competition, the North Atlantic and the popularity of the trans-Atlantic trade of the early/mid 20th century drove the design of liner hull forms as far as speed and efficiency.
Tradition, nostalgia and, in my opinion, a bit of a business gamble drove the QM2 hull design because her owners wanted to follow, at least in part, the trans-Atlantic trade of her predecessors. To my knowledge, no other company is setting this as a priority.
Perhaps a resurgence in the popularity of crossing the pond by liner will bring more cruise lines to design their ships with "liner" hulls but it will all wring out in the end in their cost-benfit analysis.