I am wondering whether the T-47 will become more viable when Striker Teams and Emplacement Troopers become a dominant thing. The Invader league seems to indicate that. I also have the suspicion that the 2-pip command card of the specialist expansion might help the T-47 in some way, because the visible part of the artwork seems to indicate that there is some Hoth-scenario with explosions in the sky.
It has a good chance to get behind a los blocker and one-shot a sniper team, but will probably need 2 to 3 shots for a FD 1.4 Laser Cannon or an E-web. It will usually win in a duell situation against one 1.4 because its shoots first. E-Web and snipers often wont even damage it. Wookies and Royal Guard will often be relativly stationary behind a los blocker to deny areas. 2 or three shots against such an asset will also do serious damage and migth clear the way for another unit to move up.
Its main cannon has 18 inch of range. That means if you flank such a position, you can usually get off either 2 shoots with aim or 1 shoot with aim and 2 shoots without (the compulsary move after the first shot will take it 11 inch closer to its target. If you dont use an aim token for your second shot, you can reduce that movement to 6 inches by angling the movement tool 90 degrees and then pivot).
If you destroy one emplacement trooper or 2 Sniper Teams, that is still just about 50% of the speeders costs. It would still have between one and three rounds to contribute to the mission, either by finishing off a damaged trooper unit that is hiding near an objective or score itself in Key positions/Breakthrough.