At the end of the day, it will be enough. However, like others, I would have liked more even if it means I'm a bit greedy. It would have been wonderful to classic Doctors on screen again (especially Paul McGann) as well as many of the companions, but I'm also very grateful for what Big Finish will be giving us.
With that in mind, below is the recently released cast list for The Light at the End
per Doctor Who Magazine:
That's a huge fan service and I, for one, am looking forward to it even more than the TV special.
That all being said, I'll still be very disappointed if William Russell doesn't make a cameo appearance on the show (yes, I know he has one for An Adventure in Space and Time