I don't think airlines will do that, because having at least two (more would be of course better) competing manufacturers in the market is better for them, so they have to hope that Boeing survives even if they don't currently use their planes...
It is like Samsung shitposting on Apple about removing the 3.5 mm audio port, enjoy the marketing stunts, and then remove it themselves a coupl eof years later. All companies and their PR teams know the memory retention of their audience is tiny. I'm honestly surprised the airlines that dont have Boeing 737 in their fleet are not taking this opportunity to make a splash yet.
