well, almost everyone here has redeemed a ticket and you want compensation when an airline downgrades its equipment? If you issued it with miles, then you have to go back to your original FFP to sort it out. TG will not compensate you as they've given you advance notice.
As for change fees.. well, if you're flying on a real F class ticket... then no change fee required. Changes permitted everytime.
TG probably decided to downgrade after they saw the number of award bookings vs revenue bookings.
The A330 aircraft could have the old old Business Class seats too !
Enjoy !