score:7
Well, first let's talk about the air sickness bags. They are not really decreased, it is just how fleet servicing work sometime. When a plane arrives a major base of the airline it get fully serviced, that includes placing in flight magazines and air sickness bags, etc. This happens also when the plane has an enough ground time without passengers onboard. As the plane proceeds with its schedule for that day (5, 6 legs?) the supply of bags on seats goes less as the plane does not gets fully serviced in every stop usually due to short ground times.
Now, let's talk about what to do if you are one of the unlucky people who have a strong urge to vomit but no air sickness bag available?
Now, if you did it anywhere other than the toilet, ask the flight attendants to bring you two blankets. Use the first to wipe it, the second to cover it (if they didn't do it themselves). The clever tip from a senior cabin crew member is: ask for a coffee bag! The same one they use to brew coffee onboard, cut the bag open and just cover the vomit with coffee before putting the blanket. I can assure you the smell will be 90% less, which means less embarrassment for you and more comfort for all people around.
Remember: There is always a stash of those somewhere in the plane, you can always ask to have one from cabin crew.