AMD has now indicated they are discontinuing production of RX 5000 cards. The RX 5000 line cards are still selling fairly well so inventory should be sold off fairly fast.
The move suggest AMD is preparing to introduce RDNA 2 cards at the lower price points. RDNA 2 cards provide more performance and AMD intends to improved the lower price points with the new logic.
Usually when a new architecture is released the whole lineup is revamped over the course of 6-8 months. This suggests new cards will be introduced in Q1 and Q2 2021.