Assuming nothing gets nerfed/removed, will you still visit your garrison every day?
I know some stuff won't be relevant anymore, mostly profession stuff, but some will:
Treasure missions will still be there.
If you care about pet battles, the levelling tokens will still be there.
The Salvage Yard will keep being a good source of gold.
If you have the buildings, it will still have a personal bank/AH.
All of that still seems like reason enough for my Garrison to stay relevant, particularly if I still plan on paying for my sub with the token.
Not to mention...I'm kinda used to it now. I can't really imagine not going back to my garrison after I'm done for the day.
Do whatever I'm supposed to do in Legion, and then heart back to my Garrison to log. I'll just use the regular heartstone to go back to Dalaran the next day.