Good marketing speak. They can't cater both formats equally. They'll have to balance Wild which costs resources. If players go for the latest and greatest (Standard) you can forget it with your old cards. Even if you won them in single player (those get removed as well). They won't take Wild too serious because the money's at Standard. So Wild will always be a second class citizen.

It also seriously pisses me off because I spend a good fortune on cards when Hearthstone came out and I didn't expect them to go the MtG route. Boy, was I wrong. Many of them are worthless now.

That just means they need to do some "hall of fame" actions in Wild to balance which could have backlash (ppl expect Standard to rotate/change, but Wild is Wild!) - any changes they do to cards in Wild may have impacts to Standard (i.e., if it's a Standard card that's reacting to Wild cards)

But this is Blizzard, and they released balance updates to Starcraft for years. Just takes focus.