Why is it a bad plan? I rarely game anymore so that has about zero percent priority for me. I am familiar with the performance of the GTX 1050 as I used to have one actually (sold it with my ThinkCentre M91p MT; it was my first dGPU) My WX 2100 is about 2 years old now (well, I bought it "open box" on eBay so there is no way to know for sure if it was actually new in 2020). Replacing it in 2 years would be reasonable. If I can still sell it for at least $30 or something then and get the A310 for less than $100 then I think it would be a decent deal. Performance will improve over time, especially on Linux (performance improvements were made recently even for the driver of the Northern Islands iGPUs in my laptops). I do think that having AV1 encoding/decoding is very valuable, maybe not $70 but the A310 will have some other advantages too undoubtedly (I think it will perform better for compute at least than the WX 2100), AV1 is becoming the new standard and it will stick around for a long, long time almost certainly. It does not have the patent mess of H.264 and H.265 and it saves a ton of space. I could let the A310 reencode lots of H.264 videos where ultimate quality is not important and save a ton of space (and therefore $). Now, I could get the A380 instead but I don't like that many cards need a power connector (and I don't want the factory OC anyway) and it is more expensive. Nvidia is not an option for me on Linux and too expensive and the RX 6400 would considerably more expensive than the A310 too and completely lacks any kind of encode.
I just hope that they will at least keep selling the two low-end cards (A310 and A380) for a long time (like the GT 1030), so us cashstrapped consumers can get them new at a good price, regardless of the broader success of the Arc series.