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It's basically impossible to review and touch the whole code base if it's 100MLOC.

Unless there is a very good reason that convinces the business sponsors that it's OK to spend a few man years on it. Switching to a shinier version of the programming language usually isn't.

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Are those projects likely to switch to c++11 or c++14 which dint have breaking changes? It seems unlikely. In which case why not break things?

Those kind of projects tend to use an ancient proprietary compiler that is no longer maintained.

Google brags about constantly doing large scale refactoring on heir codebase.

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