I had a teacher once that said every situation can be analogised by comparing it to an ice-cream shop. So here goes?
Some people, old school flavour fans, remember ice-cream being some niche item - a sugary treat for little kids, or something you had in hospital if you had tonsilitis. Most adults wouldn't eat ice-cream more than a couple of times a year, as they preferred cake or fruit for dessert. That's what grown-ups did. Because of this, not many stores sold ice cream, and those that did only had a few flavours: vanilla, strawberry, chocolate, and a mint chip.
Now the ice cream lovers are worried, because things have changed - adults have discovered the joys of strange new flavours at a restaurant one time, and now they want ice-cream almost as much as the original affcionados. And because they didn't really eat much ice-cream for a while, they want different flavours. Rum raisin, or cookie dough, or coffee ice cream, they say. Mango sorbet. Macadamia with a caramel swirl!
The afficionados are panicking now. What if introducing cookie dough means no more vanilla?
But what they don't realise, is that because all of these new customers are showing up with money and an appetite for ice cream, the owner of their favourite ice cream store can expand. He's now got enough space for 32 tubs at the front. And while his new customers want rum raisin, his old customers are still buying vanilla just as much. Not only that, but these new customers are trying the old favourites too and some of them really like them - so he's selling even more vanilla than before. Ice cream is every where, at every shop, and there's so many places to get it from that even if one store closes down, there's three others that will have what you want.