As others have pointed out, skipping parts of the lower levels might also mean that people will skip making gear for the MB. Also I honestly dont see crafting being more engaging in the higher levels. You still have to gather all the items (and they will be harder to gather too..so skip potion for the gatherers too?) and then craft it with either a fixed rotation or not. There are just more skills to use but in the end crafting does not change much, so if you already dont like crafting from the beginning how will you like it in the end? Especially since you need quite the time to get good gear for your crafters to even craft something at high level. And again lets not forget that a lot stuff has to be gathered too or bought. So the true investment comes with the highest levels and will someone really stick with it when they cant even get there from the start?
You will need the other crafters, and you will need the other gatherers on high level with high gear to even be able to do most of it alone...that means people would then need to either buy potions for all of them and then still level and gear them all up or they will have to invest a huge amount of gil in mats.
Again if you would skip crafting completely because of the lower levels then I kinda doubt one would truly enjoy crafting as whole. And this is why I pointed other examples. They might not be the best fit but they are still content, just like crafting is. And what difference is there to someone wanting to skip the level up part of the crafting with someone skipping the whole training part of a raid? In the end they skip it to get to their reward faster. And at least jump potions were introduced because battle content limits you. But you dont need crafting to beat the normal battle content in the game.
And lets not forget that it gets easier with time. More beast tribes, better exp and they even hinted that they might change crafters a bit. Heck you dont even need to gather your own items anymore for the job quests.