Perl should drop sigils entirely.
Having actually patched the Perl 5 parser and lexer multiple times, I'm going to pull an argument from authority and say that if you like never getting new features in Perl, dropping the sigils is a wonderful idea.
To make Perl work without sigils, you probably have to drop context, you definitely have to drop barewords, you likely have to drop prototypes, you may have to drop import() in some cases, and you can probably get rid of BEGIN. Alternately, you have to namespace or prefix new keywords to prevent collisions.
I can't imagine a pleasant result.
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