S8 Fusion Arts is pretty much confirmed to be a V-Union focused set. V-Union cards will be printed in booster sets, and it'll probably be a nightmare for both players and collectors alike to get all the pieces they want. It's just a matter of time, unfortunately. Hopefully they continue to make some of them accessible through promo boxes like these, but there will definitely be some which are booster exclusive.
Actually, Fusion is a new type of Battle Style, which will be featured on Mew VMAX and other cards.
Also, remember that nothing has actually HAPPENED yet. We don’t know WHAT TPCIs plan for these is yet (besides making money, obviously, but hey, it’s not as if capitalism isn’t a thing). Discussion is great, but even if TPCI may not be doing everything exactly what many of us would want, they are capable of making smart marketing decisions. Also, whenever one party gets what it wants, another party misses out. For instance, what is good for collectors may not be ideal for players, and what is good for scalpers is probably not good for investors (yes, there’s a difference. Scalping is to day-trading as long-term investing in sealed product is to long-term stock market investments).