If you want to know what the riffraff sound like, listen to a CB on channel 19 for a few minutes.
You are absolutely correct about channel 19. However, any one of those truckers could have passed the test for their tech license if they wanted to -- but they still don't. The existing test is still enough of a barrier to keep out the riffraff, despite 2-meters being a lot clearer with a lot better range.
Morse code won't cause a bunch of CB'ers to suddenly rush to HF, any more than the existence of tech has cause a bunch of CB lids on VHF.
KG4ZUD