Example: It may become 1 RP = 0.75 sats or 0.5 sats but they wont increase it to 1 RP = 1.5 sats
So it's better to exchange it now while the exchange limit is reasonably well and enjoy the 4% APY on it.
They aren't going to decrease the exchange rate of RP. Because we receive most of the RP by playing the multiply BTC game. And the wagering ratio for getting 1 RP remains same always. We (some forum members) had some discussions about it with TheQuin a few months ago when Bitcoin price was above $50k. Anyway, it is always better to exchange the RP into BTC for getting the benefits of 4% APY.