Looks like it's still going strong! With the fourth expansion to come out in 9 months, it seems that there is a strong market for home based RFID CCGs, not just in the arcade. Two things that probably helped this:
1. The portable nature of the game system coupled with the rampant popularity and coverage of the NDS.
2. $1.50 for a booster pack, way cheap for a collectible card game, let alone one with new-fangled tech.
For those of you interested more in this particular system, here is a link to an detailed look at Konami's first foray into the non-arcade RFID CCG world:
RFID card battling game Juushinden roars onto the Nintendo DS