If they continue to print maindeckable cards like these that prohibit specific prominent strategies, we'll eventually arrive at a point where the meta can't be anything but rock-paper-scissors with extra steps, except there will be more than just three archetypes in this awkwardly uninteractive relationship; the meta will be a boring mess.
It's bad enough now that we are expected to dedicate 4-6 sideboard cards against dredge, 3-4 cards against Shops (depending on your maindeck choices), and a bunch more to address the weaknesses of your specific deck.
Luckily for now, many of such sideboard cards can address multiple archetypes, allowing relatively frugal use of sideboard slots. But with each viable newly printed card that lops off a specific strategy from a match, affected decks would need to cram more sideboard cards into the already tight sideboard to compensate. If the invalidated cards are powerful cards that require and reward building around outside of such matchups, the affected decks would need to rely on 1-of or 2-of silver bullet sideboard cards, or give up sideboard cards for other bad matchups that are bound to exist.
Decks becoming obsolete is a common occurrence. But when strategies that are employed by a significant portion of the meta becomes heavily hindered or turned off by not just a few sideboard cards, but 10's and 20's of maindeck, possibly uncounterable, one-sided non-artifact creatures (for which there is no Hurkyl's Recall equivalent) like Kambal, Leovold, Thalia 2, and so on, in addition to the usual spells, enchantments and artifacts, how many negatively affected players will feel compelled to continue playing Vintage?
Even the decks that play these cards themselves will lose to coin toss, rather than skill, too many times in mirror matches. And how many pointless Karakas ping pong games will be played before people decide this game isn't worth their time anymore?
If printing cards like this were a unique or uncommon instance, it would be fine. But this card is the result of an ongoing trend of overpowered creatures that is set on turning every format into slow, creature-centric bore, where 'interaction' means hosing noncreature spells for as long as these cheap, one-sided permanents are in play, and turning them sideways.
Maybe this trend is a good thing for some players. But I can imagine a lot of people leaving the format if the trend continues and every fallout from Standard is allowed as a four-of for months after they are released. Restricting potentially broken new cards and determining if they should be unrestricted over a period of time doesn't seem like such a bad idea anymore.