Its bad to lump all sorcs in the same group since this is a Specialist issue.
Specialist were not "known" just for their Eva. They didn't even get massive Eva until their self buff came into content. Before that they were known for their split personalities of Demon for high magical damage and Knight for high defense tanking.
Everyone has been harping for class balances for a long time and even though boss told everyone it would happen at some point everyone "yeah righted" the statement.
It is no surprise that this is occurring or will occur and I dare say if it is happening or will happen there is no telling what changes await.
Only time will tell