That's bullshit. A more accurate statement would be that large companies have a lot of momentum and often have the turning radius of an aircraft carrier, but that have absolutely nothing to do with technology choices. The age of "no one got fired for choosing IBM" is over.
At my company, the team using Java+PostgreSQL is twice the size (~120 people) of the team using C#/MSSQL (~60), and the only ones really "stuck" right now re: tech are the ERP folks, because that has such a huge switching cost in the change management/training side of things, not to mention the whole "what do I do with all my legacy data when it doesn't have a natural fit in my new ERP?" problem.
At my company, the team using Java+PostgreSQL is twice the size (~120 people) of the team using C#/MSSQL (~60), and the only ones really "stuck" right now re: tech are the ERP folks, because that has such a huge switching cost in the change management/training side of things, not to mention the whole "what do I do with all my legacy data when it doesn't have a natural fit in my new ERP?" problem.