Just thought about this..... Just to supplement the shortage until they can come up with something, I think they should allow us to get weapon parts from dismantling the test guns on Arms day. If you've completed the test then you've put in the work to deserve a few weapon parts from doing the test anyway. Why can't we get something out of that??
Edit.... Good to see this is trending. I'm a person with a good amount of weapon parts but I think this is a good idea to help those struggling. This is definitely not a fix but rather a way to help until they can come up with other ideas on how to permanently fix the issue. I agree that a few weapon parts don't help tremendously but if you do all the guns across all characters then you'll have something to work with.
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Poe still drops lots of weapon parts, for now the weaponsthat drop from there still offer a high amount of partd.