No, it's proof of the trend. Exploder Wizard was talking about where D&D is going, not where it is today. I provided evidence; those products are the canaries in the coal mine, so to speak.
If accessories like gaming tiles are evidence of the game ceasing to be a roleplaying game, then the Dungeon Geomorphs and Outdoor Geomorphs published by TSR in 1976 are evidence of it, which means that it ceased to be a roleplaying game 30 years ago.
If accessories like power cards are evidence of the game ceasing to be a roleplaying game, then the Spell Cards sold in 2nd Edition are evidence of it, which means that it ceased to be a roleplaying game 15 years ago.
So, if TSR producing the same accessories that you claim turn the game into something other than a roleplaying game a long time ago, then I guess D&D hasn't been a roleplaying game for a long time... which, of course, is a completely ridiculous claim, just like the one you're making.
But to directly refute one of your claims, all of those products have a collectible element. Even power cards, if you consider the need to "collect" splat books.
This means that every edition of D&D to date is a collectible game then, so your fears about it changing into one are about 34 years too late. However, the actual point wasn't the collectability of materials, it was that the existence of these materials is somehow evidence of the game ceasing to be a roleplaying game, which is a completely bogus claim.
Of course they are "optional", just like buying the next season of Magic cards is, right?
Magic cards are the central point of the game. Minis, dungeon tiles, and power cards (which haven't even been published) are not the central point of D&D. The books are the central point. A new set of Magic cards is akin to a new book supplement, not a set of Dungeon Tiles or miniatures.
The contention is that D&D could lead to a pure skirmish game, like Warhammer.
The contention is that accessories that have been a part of the game for a decade at the least are turning it into a non-roleplaying game. A contention which has no actual evidence, just people repeating the same unsubstantiated point over and over again.
The contention is that D&D could lead to a pure skirmish game, like Warhammer. Those games have rulebooks and dice too. What they lack is a roleplaying element, which is all we're sayin'.
What you're saying makes so sense at all.
"All you need to play D&D these days is a big table at your FLGS and some glass beads to track your HP."
So, according to you, needing only (a) game materials, (b) a big table at my FLGS and (c) glass beads to track HP (for whatever reason, since they aren't necessary in any game) is evidence that D&D is moving towards being a non-roleplaying game?
So, following that "logic," the fact that all I need to play OD&D/1e/2e/3e is (a) game materials, (b) a big table at my FLGS and (c) glass beads to track HP (no reason I can't use the same game aid in any edition of the game) must mean that this trend you claim is new has existed for the game's entire lifespan.
Besides, I've never played WoW (or any MMORPG), so I wouldn't know.
Well, glad to see you have enough presence of mind not to try and argue from a position of complete ignorance, like so many others. It makes me think there's hope for you, yet.