Hello...
Changes are likely to happen, nothing is permanent. You never know if your profession suddenly gets into high demand in certain part of canada or overall, you will be lucky and you can apply that time. Now for so many other professions also , it is blocked but things will change God willing and more number of professions will be added.
In my case i am from finance n banking, when i applied in 2007 oct, i qualified but now its no more in the list.... So i agree to Saki as well that it might change again for GOOD in near future.
All the best !!!!