> perhaps lead to other BASIC implementations being open sourced as well.

A good start would be for MSFT to also open source the related BASIC-68 and BASIC-69 versions.

> "The extended 8 KB version was then generalized into BASIC-80 (8080/85, Z80), and ported into BASIC-68 (6800), BASIC-69 (6809), and 6502-BASIC." - https://en.wikipedia.org/wiki/Microsoft_BASIC