I am really interested to see where this goes. There are a few things working against fusing cards.
Gas fees will be a problem with fusing low-end cards, but this is where there is a lot of fusing opportunities. I have been giving them some ideas on a solution for this but without anything in place, the gas fees for fusing will likely be a big factor in discouraging it.
Opposite scarcity, this is a pretty unique situation that I am curious about how it plays out. First, we all know Diamond is the most sought after quality shine on a card and the rarest. Fusing cards will increase the number of high rarety cards on the market at the same time reducing the low rarety cards, in theory, making low-rarety more expensive and the high rarety less expensive. Of course, low-rarety will never exceed the higher rarity cards, but it will shift the prices on both.
As you mentioned in another comment the actual gas cost. That is higher than I was expecting. I can only hope there will be an option for mass fusing or some other way to try and bundle a bunch of actions all at once.
I could see people taking a loss after paying gas for buying, fusing, and trading. I doubt the average player is going to use an Excel sheet and work out if it’s worth or not. They will just do some quick math and think they could make a couple quick bucks for going through the process.
I’d hate to see gas be the contributing factor in not getting enough players to keep it interesting. I’ve played a couple of TCG where the player base was small and it gets boring fast facing the same dozen players over and over.