There is still space at 61.5 for them. They were on 61.5 until a few weeks ago when Dish moved them over to 77 to load test the satellite.
Its easy for them to move them back.
I think you mean the Nimiq 5 satellite at 72.7 W not 77 W. If there is room for additional HD programming on 61.5 W right now, when E-6 gets moved over to 61.5 W, I would expect that the WA would then have the limiting capacity for adding more CONUS programming although the E-14 launch and conversion to 8PSK on the WA may change that.