RE: I'm at the Frontier in my Splinter Journey

Yeah, it's likely the Foundation cards value will go down. They say that themselves. There is that weekly draw which may be a good incentive to keep playing...

What Splinterlands really needs is Draft Mode / Arena.

That eventually could come, but depending on how you/they envision it, it could take a good while to be implemented if they decide to push on something like that.