The power creep is real with this one. Power creep exists in order to make people get new cards, and to try and create change within the meta, otherwise people would only play older cards and we'd see the same decks thrive in rankings from the start of a rotation until the next rotation. The only viable way to get rid of the power creep (or at least reset it) would be to completely cut out all existing sets and state that only sets produced from a certain point onward would be in standard. These sets would of course have weaker Pokemon and more balanced mechanics.
The only issue with that being that it could possibly alienate all current players, whose entire card sets would become utterly worthless in standard and would be forced to buy large amounts of cards from the new set/sets in order to compete, and due to this requirement, could see the TCG player base drop either significantly, or not at all.
Another option could be that they produce sets without any power creep affected Pokemon and when rotation comes around, they cut off the sets affected by power creep and that resets the power creep. The problem is that this means that sales of Pokemon TCG would be reduced as players would have no reason to get the new sets as almost none or very few cards were usable in the current meta, resulting in lacking sales for the TCG and then when rotation rolled around, players that hadn't bought cards from the latest sets would be forced to stock up on lots on cards in order to keep up with the meta, but that still wouldn't help sales recover all that much, and for Pokemon as a company, such a slump in sales, however temporary, would be unacceptable.
In short, in order to reset the power creep, Pokemon would either have to alienate the entire player and force them to get new sets of cards in order to play the game in standard, or would have to accept a fairly significant slump in sales before the next rotation, in order to prepare the meta for a power creep reset.
Either way, both ways mean taking a risk and since Pokemon is a company, taking risks is something companies don't like to do. Also, with the reveal of Pokemon V and with Pokemon V-Max still to be revealed, a power creep reset most certainly ain't happening this generation.
Funnily enough, continuing the power creep doesn't present much risk to Pokemon as a company. By continuing the power creep, they promote the sales of new cards, and when they want to sell more cards, they increase the power creep by a little bit each time. Unless we see a reset of the power creep, I wouldn't be surprised if cards similar to "Zoroark and Legendary Pokemon" eventually become standard playable cards within the next decade.
While the power creep almost certainly dooms the evolution mechanic to uselessness, unfortunately, the TCG has been Basic Pokemon orientated since the advent of Pokemon EX with Next Destinies in 2012, so ultimately, the power creep hasn't changed much of the game since then.