With the fact that you can earn cards for free that have value, I am planning to continue playing. I have also been the beneficiary of some giveaways that have increased my inventory, so I am slowly beginning to accumulate some monsters. It looks like if I sell my higher valued cards (I got a couple of gold foils), I should be able to start buying summoner cards (possibly even to the point of upgrading) which would allow me to start making use of higher level cards.
I also have a love of card games (I have been playing Hearthstone for years and I play a similar Christian card game called Redemption offline). However, I would think the "barrier" would probably be a hinderance for someone that is not familiar with TCGs and would likely lead to a loss of interest. Whether that would happen anyway is anyone's guess.