Aren't clients considering migrating to different tech? I'm not trying to be annoying, genuinely interested. My current company considered it and they're a Ruby

Aren't clients considering migrating to different tech? I'm not trying to be annoying, genuinely interested. My current company considered it and they're a Ruby shop (luckily for them they rejected the idea). The thinking was something along the lines of Ruby is declining and how will they find developers 10 years from now. So if people can get this paranoid about Ruby I'm interested how it is on Elixir land.