They are saying that it would take two and half years to integrate P&W’s geared turbofan into the A320.

The end date would depend on when they started, and at this point, a stumbling block would be that P&W is not releasing maintenance costs specifics.

When one considers the fact that what killed Thielert was the frequency of maintenance, and that the primary concern over the GTF is maintenance, so I would not expect any effort to integrate the engine until Pratt & Whitney either gives some guarantees, or there is some data on the wing in commercial service.