I'm not overly concerned by what John Reardon has to say in a magazine not geared towards watch lovers, and I certainly see zero basis for a "bubble bursts" scenario, which smacks of VRF groupthink when it comes to any valuable brand that doesn't have crown or a PP seal. I believe that the future will be a bit rough to speculators in the "second tier" brands, but sports watches / manufacturers with legitimate historical provenance and ingenuity - my own bias, but I'd consider that group to principally be Rolex, Omega, Tudor, and Heuer - will absolutely be fine, and in many cases continue to increase in value.
Quite frankly, Christie's has fallen behind Sotheby's now and recently "stepped in it" with the Skipperera debacle. I don't think his opinion will influence many collectors who can think for themselves...but maybe that's just what us Heuer enthusiasts yell at each other in our safe space!
Cheers,
Rob