Very Clear No!
The long term benefit of this will be close to zero.
Instead we should work on making SPS accessible to GAMERS outside of the cryptospace. For example by buying SPS with Credits or PayPal.
Stop putting short term gains over long term success.
I don't think @elon777 was suggesting Splinterlands would need to be market maker on both sides. SPS can be sold on various markets, so SPL doesn't need to make both sides of the market - it could actually just capture a small markup on selling in-game, but not offer any redemption ability. However, there might be some KYC and anti-money-laundering reasons against directly selling the currency in-game.