No a bigger barrier for illegals might be dealing with the State Police and the political hacks and lackies that run the DMV in Massachusetts, oh man it makes a Soviet Union Bread Line look efficient. Think about standing in line for potentially for an hr+ to get anything done. I haven't lived their in eon's but my dad had a long wait recently. Here in Michigan, it is run like a small business, 1/2 hr max, and if you pick the right time to go, 5 minutes max...
Actualy, when I moved back to the US from India, I moved to MA (have family there). I went to get my license, and it took about 10-15 minutes. There were maybe 8 other people there, and the counter clerks were very efficient; if anything, it was the customers not being ready when it was their turn that slowed things down.