We can take some pages from “how https became standard” & apply it to zcash - HTTPS - Wikipedia (check browser integration section).
First thing to do is make wallets show a warning when they are sending ZEC to t-address. cc @zooko @amiller @tromer @nathan-at-least @daira @str4d @adityapk00 wdyt?
Also do we have a wallet feature that automatically turns t-addr to z-addr?