I did, it's called buying Pro Tools HD, only to have Accel come out after I shot my wad.
It is the nature of the biz. No studio ever stopped purchasing anything. First it was custom consoles, 4,8,16,24,32, etc recorders (pick your platform analog or digital), then it was automation, digital reverbs, delays, house sync systems, monitors, mics, etc.
New products do not always make what you have worthless. You may not be able to use the next gen stuff to it's fullest capabilities right off the bat. What you have been using for the past three years may be more profitable, as it may have less down time. There will be bugs the first year. Third party manufacturers have to get their lines adapted. There are conflicts with that, etc.
Your gear still works. If you can't work without new toys then you better quit, because there will always be somebody with more than you. It doesn't bother me, because I go to the same sale/bid sites that the big studios liquidate on, and see those new toys not being used there either.
What has changed the DAW world so dramatically that you have to ditch your current, recently purchased system? Not much.