I migrated 500+ custom asset canisters from Motoko to Rust of Papyrs on mainnet last Friday. Here are the two major things I learned while developing such a migration.
Once again, a big shout-out to everybody who helped here on the forum by answering my dumb newbie Rust questions. You are amazing, thanks so much 
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You’re going the wrong way!
Just kidding! Great article. I’m guessing this goes both ways?
Hahaha could be.
I did not mention it in the article - did already on twitter - but the major reason was the fact that I did not manage to implement certification in my custom asset canister despite my effort. Knowing I could “just” had a look to existing examples - notably NNS-dapp since I know its frontend a bit 
- also convinced me I could jump and learn Rust.
The beauty of the IC, being able to switch between programming languages is amazing.