Any young artist eager to jump into professional work will likely see the "Turnips or RLC" option and think "Well, I doubt I'll be accepted for RLC, so I'll just do turnips and have a higher chance of getting hired."
That's really just my main concern. That the people who will gravitate towards that option are people who are already sceptical of the worth of their art.
I'm not really commenting on whether having the option in itself is bad. I just hope this is considered. There will be people /settling/ for turnips not because they want them, but because they aren't confident in their ability to actually make money. Accepting their work with a fake currency might just cement that idea in their head? I don't know.

Glad to see new artists are being hired though. I hope people who want turnips can at least get paid partially in RLC, though.