I think it will also take a bit of time for the tbt prices for items to sort themselves out too.
^ Agreed.
My thought is like what Justin said. It'll depend on how fast the method of hack/cheat spreads to be common. And I'm assuming it'll go all the same as how it was in NL, as Switch is easier to hack the system compared to the 3DS, which actually had something to do with the change of low in Japan earlier of this year regarding infringement to the creative work.
Speaking of which, about the value of forum currency or TBT market economy/demand on collectibles, I've been wondering how many people are aware of it that when in-game items/money has quite low value, economy of tbt currency wouldn't be active much, at least among new members. For example, say, like in current NL market, you only get 1-3 forum bells for selling an in-game item or service, then it'd be hard for you to earn enough forum bells to buy off valuable/popular collectibles. The only active members in that section will most likely to be the same group of people, those who only actively buy/sell collectibles and can gain big profit by that. When it's the only way to earn good amount of forum bells in short length of time, it naturally results in fewer members in the tbt market, which wouldn't help the market to be active. And that is how it is now.
If the hack/cheat in Switch game gets common, it'll just go the same as it is now. That's what I assume. Though, like how it was when amiibo update was released, there's a good chance that people will pay good amount of tbt bells for new item at launch. I remember some members were selling a New Nintendo 3DS or Wii U console item in NL for like 100 tbt, and yet there were not very few players who were willing to pay it.