I am likely one of the few players that will be affected.
I believe I have (financially) contributed much more than an average player having purchased multiple accounts/expansions (for myself and friends/family for GW1 and 2), many in game upgrades and even a reasonable amount of merchandise (easily adding up to many100s or even 1000+ since launch).
yes my main rig is over 10 years old, but with an i7 CPU (8 core @ 2.80GHz), 16GBs RAM (1333MHz DDR3) and 4GBs GPU (GeForce GTX 260), it is still more than capable of running many games (currently GW2 at near max settings).
however although the rig is already running DirectX 12 its the graphic card feature levels are "10_0, 9_3, 9_2 and 9_1", so there is a good chance it will no run the new client.
I do plan to purchase a new rig but not for a year or 2 (unless this one packs up).
although my laptop meets the new specs and I will still be able to play from time to time it is unlikely I will be buy any further updates/upgrades until I replace my main rig (which could be a couple of years away)