Sorry but that's both a naive a superficial analysis of two separate problems. Excessively large breasts cause a different problem to small breasts. Women with boobs that are too big commonly suffer back and other muscular pain, they get stretch marks and because breast tissue is hormonally sensitive these women become victims of their own monthly cycles with tenderness, lumps and other problems. In addition, they get a lot of attention. Any manner of idiot will harass and try anything to get their attention.
Small boobs don't cause health problems like that. In most cases, like this women in the Sun article, these women are unusually petite and "in proportion" with their boobs. Their unhappiness comes from body image perception, ie a distorted view of what they think they should look like. Men get this too, not as common, eg using drus or surgery to look more muscular. Body dysmorphia comes in other forms too eg eating disorders.
It is almost never the case that achieving a body change will "cure" the depression or desire for further change.
