What would happen if the dominant base for numerals was octal instead of decimal (which would change the base)? I'm thinking the Roman, Hindu-Arabic, Chinese, and several African numeral systems as the starters (since most modern languages have their number system derived from one of those and even thought OTL Europe uses Arabic Numberals, Arabic numerals might have been slower to adopt in Europe if they use base 8 while Romans used base 10).
There are languages with different bases. For example, the Aztecs used 20, some Sumerians used 60, and some Native Americans in California actually did use 8.