Polax52, In case you are wondering the phase out of the B77-200 has been planned and accounted for by "those in the know" for at least the last three months. It is no surprise at all. There'll be no surplus crew problems, or if there is it will be only temporary, as the plan is to CCQ the surplus portion of B777 crew to the B787's due soon to arrive, or transition them to the B787 as a single fleet.
Obviously, the first option is the most cost efficient for the company and that is what is being advised and has been so for at least the last three months. There is also a big shortage of crew on the A330, which looks like it is going to be a big money fleet going forward for the next few years due increases in destinations, frequencies and hours. It may also be an alternative for any surplus B777 crew that do not fancy the B787 or too much B777 long haul.