I agree.
If they ditch the levels then not only will everyone be able to overflow the market with these desynth-only materials (and glamour), severly reducing their worth, but also the "specialization" aspect will be lost since currently you can only desynthesize in 3 categories at a time.
A different approach that I wouldn't mind is tie desynthesis to crafting levels and make it so Specialists have 100% desynth rate while non specialized crafters only have 50% (as long as the class level matches of course). This way there is still barrier to entry albeit much softer than before and the system is less tedious while providing value to your chosen specialists.