Okay I am going to throw a prediction out there. If this move does go ahead (at amazing short notice!) I predict that either Thai Smile will transfer all flights back to DMK in 18-24 months due to it 'not being good for our connecting international premium customers' or Nok Air merging in to Thai Smile and it staying at DMK as a stand alone airline.
I would love a read of their strategy documents (if they even exist!) the last guys idea was to use premium rice in there food, now it is to offer premium service (where they lag massively behind other carriers on premium routes such as BKK-LHR). The image they put out to the market is one of no idea. SQ and CX must have a good chuckle to themselves at times.