Sorry, I'm a perfectionist. To answer your question technically, no, you will never get used to motion sickness. You will , most likely, over repeated exposure, adapt to the motion that makes you sick. Therefore you won't get sick. But It's unlikely you'll get used to the actual sickness. Now that I've been a smart-***, I take Bonine and it seems to help. Here's a few tips:
What Can I Do for Motion Sickness?
Always ride where your eyes will see the same motion that your body and inner ears feel, e.g. sit in the front seat of the car and look at the distant scenery; go up on the deck of the ship and watch the horizon; sit by the window of the airplane and look outside. In an airplane choose a seat over the wings where the motion is the least.
Do not read while traveling if you are subject to motion sickness, and do not sit in a seat facing backward.
Do not watch or talk to another traveler who is having motion sickness.
Avoid strong odors and spicy or greasy foods immediately before and during your travel. Medical research has not yet investigated the effectiveness of popular folk remedies such as soda crackers and & Seven Up® or cola syrup over ice.
Take one of the varieties of motion sickness medicines before your travel begins, as recommended by your physician.
Some of these medications can be purchased without a prescription (i.e., Dramamine®, Bonine®, Marezine®, etc.) Stronger medicines such as tranquilizers and nervous system depressants will require a prescription from your physician. Some are used in pill or suppository form.