Think of it this way: if you own 100,000 bitcoins and you know there won't ever be more than 21 million bitcoins, then you currently own 0.47% of the whole "bitcoin pie". Now if the upper limit changes to 210 million (thus the pie getting bigger), then your share of the pie suddenly shrinks to 0.047%.
If 21 million cap is multiplied by 10, then all savings are multiplied by 10 as well. So 100,000 bitcoins will become 1,000,000. It's still 0.47%.