A student would actually find more benefit in taking Line 1 and Line 2 from Union to Kipling and then the 927 Express bus to Humber, as you could get there in about 60-65 mins as opposed to the near 90 min+ journey taking Line 1 and Line 6.
Even with TSP fully implemented on Finch, it would probably either go down to being a similar time as the Kipling option, or still slightly slower. It takes 35-40 mins just to get from Union to Finch West alone so if Finch ever gets to 30-35 mins, it still wouldn't be the fastest option.
But I agree with this new Woodbine GO extension, it could completely revolutionize the way Humber College and this overall area of Rexdale is seen. Just about a 30 min GO/UP ride and then a 5 min LRT ride to Humber. People who live on Kipling or Islington can even benefit from this with just taking Line 6 to Woodbine and either heading to Union or Bramalea afterwards to connect them to basically the entire GTA, opening even more opportunities.